cc/gcc: remove --enable-symver option

That option is coming from the original crosstool, and is not entirely
understand here.

Moreover, it breaks with newer gcc-s: 4.6.1 now breaks while configuring
libjava (and probably some other libs as well, untested).

There is an related bug report to the gcc BZ:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49555

If need be, the old behavior can be restored with:
CC_CORE_EXTRA_CONFIG_ARRAY="--enable-symver=gnu"
CC_EXTRA_CONFIG_ARRAY="--enable-symver=gnu"

Reported-by: Bryan Hundven <bryanhundven@gmail.com>
Reviewed-by: Bryan Hundven <bryanhundven@gmail.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 # Build script for m4

 CT_M4_VERSION=1.4.13

 do_companion_tools_m4_get() {

     CT_GetFile "m4-${CT_M4_VERSION}" \

                {ftp,http}://ftp.gnu.org/gnu/m4

 }

 do_companion_tools_m4_extract() {

     CT_Extract "m4-${CT_M4_VERSION}"

     CT_Patch "m4" "${CT_M4_VERSION}"

 }

 do_companion_tools_m4_build() {

     CT_DoStep EXTRA "Installing m4"

     mkdir -p "${CT_BUILD_DIR}/build-m4"

     CT_Pushd "${CT_BUILD_DIR}/build-m4"

     CT_DoExecLog CFG \

     "${CT_SRC_DIR}/m4-${CT_M4_VERSION}/configure" \

         --prefix="${CT_BUILDTOOLS_PREFIX_DIR}"

     CT_DoExecLog ALL make

     CT_DoExecLog ALL make install

     CT_Popd

     CT_EndStep

 }