BaseTools: Fix build on FreeBSD and allow use of non-gcc system compiler

On FreeBSD, uuid.h is in /usr/include, not /usr/include/uuid.

Fix some errors when building using clang caused by self-assignment: the
preferred way to 'use' a variable is '(void)x;', not 'x = x;'.

Where the system provides $(CC) etc. by default, don't override it to be gcc.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Bruce Cran <bruce@cran.org.uk>
Reviewed-by: Yingke Liu <yingke.d.liu@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17866 6f19259b-4bc3-4df7-8a09-765794883524

BaseTools/Source/C/GenFv/GenFvInternalLib.c

@@ -16,8 +16,13 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 //
 // Include files
 //
-#ifdef __GNUC__
+
+#if defined(__FreeBSD__)
+#include <uuid.h>
+#elif defined(__GNUC__)
 #include <uuid/uuid.h>
+#endif
+#ifdef __GNUC__
 #include <sys/stat.h>
 #endif
 #include <string.h>