BaseTools: Remove COMMON section from the GCC discard list

BaseTools: Remove COMMON section from the GCC discard list

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2507

The COMMON section is used by OpenSSL assembly-optimized crypto
functions. OpenSSL assembly code is auto-generated from the submodule
and cannot be modified to remove dependence on the COMMON section.
The default -fno-common compiler flag should still prevent variable from
being emitted into the COMMON section.

Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Signed-off-by: Christopher Zurcher <christopher.zurcher@microsoft.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>