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_CPU="cortex-m3"

CT_ARCH_TUNE="cortex-m3"

CT_ARCH_FLOAT_SW=y

CT_ARCH_arm=y

# CT_ARCH_USE_MMU is not set

CT_ARCH_ARM_MODE_THUMB=y

CT_TARGET_VENDOR="bare_newlib_cortex_m3_nommu"

CT_ARCH_BINFMT_FLAT=y

CT_BINUTILS_V_2_19_1a=y

CT_CC_V_4_4_1=y

CT_CC_LANG_CXX=y

CT_LIBC_VERSION="newlib-1_18_0"

CT_LIBC_NEWLIB_CVS=y

CT_GMP_V_4_3_2=y

CT_MPFR_V_2_4_2=y

CT_PPL_V_0_10_2=y

CT_CLOOG_V_0_15_9=y