libast: Fix detection of GCC 4.1+ 64/32-bit atomic operations model

This fix to the atomic scalar operations feature tests is from OpenSUSE:
https://build.opensuse.org/package/view_file/shells/ksh/ksh93-aso.dif

src/lib/libast/features/aso

@@ -5,7 +5,10 @@ if	aso note{ gcc 4.1+ 64 bit memory atomic operations model }end link{
 		int main()
 		{
 			uint64_t i = 0;
-			return __sync_fetch_and_add(&i,7);
+			uint32_t j = 0;
+			uint16_t l = 0;
+			uint8_t  m = 0;
+			return __sync_fetch_and_add(&i,7)+__sync_fetch_and_add(&j,7)+__sync_fetch_and_add(&l,7)+__sync_fetch_and_add(&m,7);
 		}
 	}end && {
 		#define _aso_cas8(p,o,n)	__sync_val_compare_and_swap(p,o,n)
@@ -31,7 +34,9 @@ elif	aso note{ gcc 4.1+ 32 bit memory atomic operations model }end link{
 		int main()
 		{
 			uint32_t i = 0;
-			return __sync_fetch_and_add(&i,7);
+			uint16_t j = 0;
+			uint8_t  l = 0;
+			return __sync_fetch_and_add(&i,7)+__sync_fetch_and_add(&j,7)+__sync_fetch_and_add(&l,7);
 		}
 	}end && {
 		#define _aso_cas8(p,o,n)	__sync_val_compare_and_swap(p,o,n)