Add -Wredundant-decls to prevent unwanted duplicate declarations.

git-svn-id: svn://svn.berlios.de/openocd/trunk@1562 b42882b7-edfa-0310-969c-e2dbd0fdcd60

configure.in

@@ -779,6 +779,7 @@ if test "${gcc_wextra}" = yes; then
 	GCC_WARNINGS="${GCC_WARNINGS} -Wextra -Wno-unused-parameter"
 	GCC_WARNINGS="${GCC_WARNINGS} -Wbad-function-cast"
 	GCC_WARNINGS="${GCC_WARNINGS} -Wcast-align"
+	GCC_WARNINGS="${GCC_WARNINGS} -Wredundant-decls"
 fi
 if test "${gcc_werror}" = yes; then
 	GCC_WARNINGS="${GCC_WARNINGS} -Werror"