gcc10: Default back to -fcommon

For time being change back to -fcommon as default, helps us iron
out other issues, eventually this should be removed as we fix the
packages to work with -fno-common

(From OE-Core rev: 951e859b1e8297970278c539e989b8a6d06a9cb3)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-configure-common.inc

@@ -34,6 +34,7 @@ EXTRA_OECONF = "\
     --program-prefix=${TARGET_PREFIX} \
     --without-local-prefix \
     --disable-install-libiberty \
+    --with-specs=%{!fno-common:%{!fcommon:-fcommon}} \
     ${EXTRA_OECONF_BASE} \
     ${EXTRA_OECONF_GCC_FLOAT} \
     ${EXTRA_OECONF_PATHS} \