configure: Use the -Wignored-qualifiers compiler option if available. available.

[Gerald Pfeifer]

I made sure this does not trigger any warnings at this point.

(In GCC, this is part of -Wextra which we cannot use due to hundreds,
if not thousands, undesirable warnings, so I am only adding this one.)

Gerald
---
 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 5810111..9a4848b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1705,6 +1705,7 @@ then
   WINE_TRY_CFLAGS([-fno-strict-aliasing])
   WINE_TRY_CFLAGS([-Wdeclaration-after-statement])
   WINE_TRY_CFLAGS([-Wempty-body])
+  WINE_TRY_CFLAGS([-Wignored-qualifiers])
   WINE_TRY_CFLAGS([-Wstrict-prototypes])
   WINE_TRY_CFLAGS([-Wtype-limits])
   WINE_TRY_CFLAGS([-Wunused-but-set-parameter])
-- 
1.7.7.3