configure: Use the -Wignored-qualifiers compiler option if available.
diff --git a/configure b/configure
index fa17bcc..ef5fb31 100755
--- a/configure
+++ b/configure
@@ -12062,6 +12062,31 @@
if test $ac_cv_cflags__Wempty_body = yes; then :
EXTRACFLAGS="$EXTRACFLAGS -Wempty-body"
fi
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -Wignored-qualifiers" >&5
+$as_echo_n "checking whether the compiler supports -Wignored-qualifiers... " >&6; }
+if ${ac_cv_cflags__Wignored_qualifiers+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ ac_wine_try_cflags_saved=$CFLAGS
+CFLAGS="$CFLAGS -Wignored-qualifiers"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+int main(int argc, char **argv) { return 0; }
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+ ac_cv_cflags__Wignored_qualifiers=yes
+else
+ ac_cv_cflags__Wignored_qualifiers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+ conftest$ac_exeext conftest.$ac_ext
+CFLAGS=$ac_wine_try_cflags_saved
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_cflags__Wignored_qualifiers" >&5
+$as_echo "$ac_cv_cflags__Wignored_qualifiers" >&6; }
+if test $ac_cv_cflags__Wignored_qualifiers = yes; then :
+ EXTRACFLAGS="$EXTRACFLAGS -Wignored-qualifiers"
+fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -Wstrict-prototypes" >&5
$as_echo_n "checking whether the compiler supports -Wstrict-prototypes... " >&6; }
if ${ac_cv_cflags__Wstrict_prototypes+:} false; then :
