libc/eglibc: fix missing LIBC_TRY_CC_OPTION definition (eglibc 2.15)

Upstream SVN is currently broken:
http://www.eglibc.org/svn/branches/eglibc-2_15/libc/

LIBC_TRY_CC_OPTION macro is not defined in aclocal.m4.
This patch fix the configure script.

Once upstream branch will be fixed this patch could be reverted.

Related patch (committed to eglibc trunk):
Use autoconf macro for testing compiler options with empty input
http://sourceware.org/ml/libc-alpha/2012-03/msg00816.html

Signed-off-by: Matthieu Crapet <mcrapet@gmail.com>

diff -r 1f6c8e4b2b92 -r d10afc5bcc25
patches/eglibc/2_15/110-aclocal-LIBC_TRY_CC_OPTION.patch

CT_EXPERIMENTAL=y

CT_LOCAL_TARBALLS_DIR="${HOME}/src"

CT_SAVE_TARBALLS=y

CT_LOG_EXTRA=y

CT_ARCH_ARCH="4kc"

CT_ARCH_TUNE="4kc"

CT_ARCH_FLOAT_SW=y

CT_ARCH_mips=y

CT_TARGET_VENDOR="ar2315"

CT_KERNEL_linux=y

CT_KERNEL_V_2_6_33_20=y

CT_BINUTILS_V_2_19_1a=y

CT_CC_V_4_3_2=y

CT_CC_LANG_CXX=y

CT_LIBC_EGLIBC_V_2_9=y

CT_EGLIBC_REVISION="{2009-07-21}"

# CT_LIBC_GLIBC_FORCE_UNWIND is not set

CT_LIBC_GLIBC_KERNEL_VERSION_CHOSEN=y

CT_LIBC_GLIBC_MIN_KERNEL_VERSION="2.6.25"

CT_DEBUG_dmalloc=y

CT_DEBUG_gdb=y

CT_GDB_V_6_8a=y

CT_DEBUG_strace=y

CT_STRACE_V_4_5_19=y

CT_GMP_V_4_3_2=y

CT_MPFR_V_2_4_2=y