BaseTools: Use BUILD_CC when checking gcc version in DevicePath
When checking the version in DevicePath's Makefile, use BUILD_CC instead
of assuming "gcc". BUILD_CC is set in header.makefile and is the
compiler that will actually be used to build DevicePath. It defaults to
"gcc", but may be overridden.
Signed-off-by: Jake Garver <jake@nvidia.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>