Pass parameter "--disable-optimizations" to
configure script to disable compiler optimizations
to fix below issue:
$ gdb /usr/bin/fio
(gdb) r -h
Starting program: /usr/bin/fio -h
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Program received signal SIGILL, Illegal instruction.
0x0000000000407220 in prio_tree_init () at lib/prio_tree.c:61
 61	index_bits_to_maxindex[i] = (1UL << (i + 1)) - 1;
(gdb) bt
 #0 0x0000000000407220 in prio_tree_init () at lib/prio_tree.c:61
 #1 0x0000000000482208 in __libc_csu_init (argc=argc@entry=2,
    argv=argv@entry=0x7fffffffecc8, envp=0x7fffffffece0)
    at /usr/src/debug/glibc/2.26-r0/git/csu/elf-init.c:88
 #2 0x00000031c742095e in __libc_start_main (main=0x407700 <main>, argc=2,
    argv=0x7fffffffecc8, init=0x4821b6 <__libc_csu_init>,
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffecb8)
    at /usr/src/debug/glibc/2.26-r0/git/csu/libc-start.c:264
 #3 0x00000000004077ea in _start () at ../sysdeps/x86_64/start.S:120

Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

Toolchains (gcc/clang) forcibly define LD (LD = ...), so, override it in
the do_configure task.

This fixes this build error (seen on AB[0]):
| Checking for pkg-config... .../tmp/work/x86-64-v3-poky-linux/libunix-statgrab/0.112/recipe-sysroot-native/usr/bin/pkg-config
| Checking for pkg-config package of libstatgrab... Unsupported compile language "C" at Makefile.PL line 39.
| -lstatgrab -lpthread
| Checking for library containing sg_get_process_stats_r... WARNING: .../run.do_configure.38403:154 exit 255 from 'perl Makefile.PL INSTALLDIRS=vendor NO_PERLLOCAL=1 NO_PACKLIST=1 PERL=$(which perl)'
| WARNING: Backtrace (BB generated script):
| 	ni#1: cpan_do_configure, .../tmp/work/x86-64-v3-poky-linux/libunix-statgrab/0.112/temp/run.do_configure.38403, line 154
| 	ni#2: do_configure, .../tmp/work/x86-64-v3-poky-linux/libunix-statgrab/0.112/temp/run.do_configure.38403, line 147
| 	ni#3: main, .../tmp/work/x86-64-v3-poky-linux/libunix-statgrab/0.112/temp/run.do_configure.38403, line 189
NOTE: recipe libunix-statgrab-0.112-r0: task do_configure: Failed
ERROR: Task (meta-openembedded/meta-perl/recipes-perl/libstatgrab/libunix-statgrab_0.112.bb:do_configure) failed with exit code '1'

[0]: https://autobuilder.yoctoproject.org/valkyrie/#/builders/87/builds/77/steps/38/logs/stdio

Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Khem Raj <raj.khem@gmail.com>