[Bug 246700] [exp-run] Update GCC_DEFAULT from 9 to 10

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246700

--- Comment #8 from Gerald Pfeifer <gerald at FreeBSD.org> ---
(In reply to Mark Linimon from comment #7)
> Linking  : dvdisaster
> /usr/local/bin/ld: /wrkdirs/usr/ports/sysutils/dvdisaster/work/dvdisaster-0.79.5/build.o:(.data+0x0): multiple definition of `buildCount'; /wrkdirs/usr/ports

Good news for our powerpc crew - this appears to be the general
   https://gcc.gnu.org/gcc-10/porting_to.html#common change,
that is, a mistake in this software unearthed by the new GCC 10
default of -fno-common.

The easy way out is to set -fcommon via CFLAGS. The better approach
long term is (for or via upstream) to fix the code per the link above.

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