Describe the bug
compiling for 32 bit architectures fails with folling error:
# github.com/godror/godror ..\github.com\godror\godror\conn.go:380:13: type [214748363]_Ctype_struct_dpiData larger than address space ..\github.com\godror\godror\conn.go:380:13: type [214748363]_Ctype_struct_dpiData too large ..\github.com\godror\godror\rows.go:292:19: type [214748363]_Ctype_struct_dpiData larger than address space ..\github.com\godror\godror\rows.go:292:19: type [214748363]_Ctype_struct_dpiData too large ..\github.com\godror\godror\stmt.go:410:22: type [214748363]_Ctype_struct_dpiData larger than address space ..\github.com\godror\godror\stmt.go:410:22: type [214748363]_Ctype_struct_dpiData too large ..\github.com\godror\godror\subscr.go:49:16: type [214748363]_Ctype_struct_dpiSubscrMessageRow too large ..\github.com\godror\godror\subscr.go:63:17: type [214748363]_Ctype_struct_dpiSubscrMessageTable too large ..\github.com\godror\godror\subscr.go:78:17: type [214748363]_Ctype_struct_dpiSubscrMessageQuery larger than address space ..\github.com\godror\godror\subscr.go:78:17: type [214748363]_Ctype_struct_dpiSubscrMessageQuery too large ..\github.com\godror\godror\subscr.go:78:17: too many errors

To Reproduce
compile your demo program in an 32bit environment, in Windows10 using msys2

1. pacman -S mingw-w64-i686-toolchain
2. install 32bit go: pacman -S mingw-w64-i686-go
3. in mingw32 environment go to your source: cd /e/Daten/go/src/oracletest
4. start build: go build

Expected behavior
proper compiling

Your oracle client version
12.2.0.1.0

Your godror version
v0.10.2

Your go version
go version go1.13.5 windows/386

Machine (please complete the following information):

• OS: Windows10 mit mingw32
• Architecture [64bit mit 32bit Wrapper]

gcc version
gcc -v
Using built-in specs.
COLLECT_GCC=E:\msys64\mingw32\bin\gcc.exe
COLLECT_LTO_WRAPPER=E:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/9.2.0/lto-wrapper.exe
Target: i686-w64-mingw32
Configured with: ../gcc-9.2.0/configure --prefix=/mingw32 --with-local-prefix=/mingw32/local --build=i686-w64-mingw32 --host=i686-w64-mingw32 --target=i686-w64-mingw32 --with-native-system-header-dir=/mingw32/i686-w64-mingw32/include --libexecdir=/mingw32/lib --enable-bootstrap --with-arch=i686 --with-tune=generic --enable-languages=c,lto,c++,fortran,ada,objc,obj-c++ --enable-shared --enable-static --enable-libatomic --enable-threads=posix --enable-graphite --enable-fully-dynamic-string --enable-libstdcxx-filesystem-ts=yes --enable-libstdcxx-time=yes --disable-libstdcxx-pch --disable-libstdcxx-debug --disable-isl-version-check --enable-lto --enable-libgomp --disable-multilib --enable-checking=release --disable-rpath --disable-win32-registry --disable-nls --disable-werror --disable-symvers --enable-plugin --with-libiconv --with-system-zlib --with-gmp=/mingw32 --with-mpfr=/mingw32 --with-mpc=/mingw32 --with-isl=/mingw32 --with-pkgversion='Rev2, Built by MSYS2 project' --with-bugurl=https://sourceforge.net/projects/msys2 --with-gnu-as --with-gnu-ld --disable-sjlj-exceptions --with-dwarf2
Thread model: posix
gcc version 9.2.0 (Rev2, Built by MSYS2 project)

Additional context
None