configure: Use the -Wempty-body compiler option if present.
diff --git a/configure.ac b/configure.ac
index 057035f..eff1550 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1728,6 +1728,7 @@
   WINE_TRY_CFLAGS([-fno-builtin],[AC_SUBST(BUILTINFLAG,"-fno-builtin")])
   WINE_TRY_CFLAGS([-fno-strict-aliasing])
   WINE_TRY_CFLAGS([-Wdeclaration-after-statement])
+  WINE_TRY_CFLAGS([-Wempty-body])
   WINE_TRY_CFLAGS([-Wstrict-prototypes])
   WINE_TRY_CFLAGS([-Wtype-limits])
   WINE_TRY_CFLAGS([-Wunused-but-set-parameter])