Generic unix makefiles: Add additional warning options.

Mostly for gcc 4.

generate/unix/Makefile.config

@@ -50,10 +50,18 @@ CWARNINGFLAGS = \
 # gcc 4+ flags
 #
 CWARNINGFLAGS+= \
+	-Waggregate-return \
+	-Wchar-subscripts \
 	-Waddress \
 	-Wempty-body \
 	-Wlogical-op \
+	-Wmissing-declarations \
 	-Wmissing-field-initializers \
+	-Wmissing-parameter-type \
+	-Wnested-externs \
+	-Wold-style-declaration \
+	-Wold-style-definition \
+	-Wredundant-decls \
 	-Wtype-limits
 
 #
@@ -64,6 +72,7 @@ CWARNINGFLAGS+= \
 #	-Wunreachable-code \
 #	-Wcast-qual \
 #	-Wconversion
+#	-Wshadow \
 
 #
 # Bison/Flex configuration