[flac-dev] replace -Wextra with -W

[Ozkan Sezer]

The attached small configury patch replaces -Wextra with -W in the
main CFLAGS and CXXFLAGS assignments. A few lines after them, -Wextra
is conditionally added already with XIPH_ADD_CFLAGS([-Wextra]), so
this allows build using older compilers.

Regards.

--
O.S.
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diff --git a/configure.ac b/configure.ac
index 6d0fa00..cc5a247 100644
--- a/configure.ac
+++ b/configure.ac
@@ -392,8 +392,8 @@ fi
 XIPH_GCC_VERSION
 
 if test x$ac_cv_c_compiler_gnu = xyes ; then
-	CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes -Wmissing-prototypes -Waggregate-return -Wcast-align -Wnested-externs -Wshadow -Wundef -Wmissing-declarations -Wunreachable-code " # -Wcast-qual -Wbad-function-cast -Wwrite-strings -Winline -Wconversion
-	CXXFLAGS="$CXXFLAGS -Wall -Wextra -Wcast-align -Wshadow -Wwrite-strings -Wctor-dtor-privacy -Wnon-virtual-dtor -Wreorder -Wsign-promo -Wundef -Wunreachable-code " # -Wcast-qual -Wbad-function-cast -Wwrite-strings -Woverloaded-virtual -Wmissing-declarations
+	CFLAGS="$CFLAGS -Wall -W -Wstrict-prototypes -Wmissing-prototypes -Waggregate-return -Wcast-align -Wnested-externs -Wshadow -Wundef -Wmissing-declarations -Wunreachable-code " # -Wcast-qual -Wbad-function-cast -Wwrite-strings -Winline -Wconversion
+	CXXFLAGS="$CXXFLAGS -Wall -W -Wcast-align -Wshadow -Wwrite-strings -Wctor-dtor-privacy -Wnon-virtual-dtor -Wreorder -Wsign-promo -Wundef -Wunreachable-code " # -Wcast-qual -Wbad-function-cast -Wwrite-strings -Woverloaded-virtual -Wmissing-declarations
 
 
 	XIPH_ADD_CFLAGS([-Wdeclaration-after-statement])