BaseTools/Pccts: Resolve GCC sting format mismatch build warning

https://bugzilla.tianocore.org/show_bug.cgi?id=282

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
diff --git a/BaseTools/Source/C/VfrCompile/Pccts/support/set/set.c b/BaseTools/Source/C/VfrCompile/Pccts/support/set/set.c
index eb6fba7..6b9b510 100644
--- a/BaseTools/Source/C/VfrCompile/Pccts/support/set/set.c
+++ b/BaseTools/Source/C/VfrCompile/Pccts/support/set/set.c
@@ -554,7 +554,7 @@
 	static set a;

 	register unsigned *p, *endp;

 

-	set_new(a, strlen(s));

+	set_new(a, (unsigned) strlen(s));

 	p = a.setword;

 	endp = &(a.setword[a.n]);

 	do {