[gettext[tools]] build failure on arm64-osx

**Host Environment**
- OS: macOS with apple m1
- Compiler: clang 

**To Reproduce**
Steps to reproduce the behavior:
`./vcpkg install gettext[tools]`

**Failure logs** 
```
Starting package 3/47: gettext:arm64-osx
Building package gettext[core,tools]:arm64-osx...
-- Using community triplet arm64-osx. This triplet configuration is not guaranteed to succeed.
-- [COMMUNITY] Loading triplet configuration from: /Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg/triplets/community/arm64-osx.cmake
-- Using cached /Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg/downloads/gettext-0.21.tar.gz
-- Cleaning sources at /Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg/buildtrees/gettext/src/0.21-508c311661.clean. Use --editable to skip cleaning for the packages you specify.
-- Extracting source /Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg/downloads/gettext-0.21.tar.gz
-- Applying patch 0002-Fix-uwp-build.patch
-- Applying patch 0003-Fix-win-unicode-paths.patch
-- Applying patch rel_path.patch
-- Using source at /Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg/buildtrees/gettext/src/0.21-508c311661.clean
-- Configuring arm64-osx-dbg
-- Configuring arm64-osx-rel
-- Configuring arm64-osx-dbg
-- Configuring arm64-osx-rel
-- Building arm64-osx-dbg
-- Installing arm64-osx-dbg
-- Building arm64-osx-rel
CMake Error at scripts/cmake/vcpkg_execute_build_process.cmake:146 (message):
    Command failed: /usr/bin/make V=1 -j 9 -f Makefile all
    Working Directory: /Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg/buildtrees/gettext/arm64-osx-rel
    See logs for more information:
      /Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg/buildtrees/gettext/build-arm64-osx-rel-out.log
      /Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg/buildtrees/gettext/build-arm64-osx-rel-err.log

Call Stack (most recent call first):
  scripts/cmake/vcpkg_build_make.cmake:194 (vcpkg_execute_build_process)
  scripts/cmake/vcpkg_install_make.cmake:26 (vcpkg_build_make)
  ports/gettext/portfile.cmake:68 (vcpkg_install_make)
  scripts/ports.cmake:142 (include)


Error: Building package gettext:arm64-osx failed with: BUILD_FAILED
Please ensure you're using the latest portfiles with `./vcpkg update`, then
submit an issue at https://github.com/Microsoft/vcpkg/issues including:
  Package: gettext:arm64-osx
  Vcpkg version: 2021-05-05-unknownhash

Additionally, attach any relevant sections from the log files above.
```
<details><summary> /Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg/buildtrees/gettext/build-arm64-osx-rel-err.log</summary>

```
../.././../src/0.21-508c311661.clean/gettext-runtime/intl-csharp/intl.cs(218,46): warning CS0168: The variable `e' is declared but never used
mkdir: sys: File exists
warning: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: archive library: .libs/libgnu.a the table of contents is empty (no object file members in the library define global symbols)
ld: warning: directory not found for option '-L/Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg_installed/arm64-osx/lib/'
ld: warning: directory not found for option '-L/Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg_installed/arm64-osx/lib/manual-link/'
ld: warning: directory not found for option '-L/Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg_installed/arm64-osx/lib/'
ld: warning: directory not found for option '-L/Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg_installed/arm64-osx/lib/manual-link/'
ld: warning: directory not found for option '-L/Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg_installed/arm64-osx/lib/'
ld: warning: directory not found for option '-L/Users/leanderSchulten/git_projekte/Lichtsteuerung/vcpkg_installed/arm64-osx/lib/manual-link/'
mkdir: sys: File exists
mkdir: sys: File exists
../.././../src/0.21-508c311661.clean/libtextstyle/lib/unistr/u8-mbtouc.c:31:1: error: redefinition of 'u8_mbtouc'
u8_mbtouc (ucs4_t *puc, const uint8_t *s, size_t n)
^
/usr/local/include/unistr.h:231:1: note: previous definition is here
u8_mbtouc (ucs4_t *puc, const uint8_t *s, size_t n)
^
1 error generated.
make[4]: *** [config.h] Error 1
make[3]: *** [all-recursive] Error 1
make[2]: *** [all] Error 2
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

```
</details>


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[gettext[tools]] build failure on arm64-osx #17892

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[gettext[tools]] build failure on arm64-osx #17892

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