Unix makefiles: Update compiler options.

Newer versions of gcc do not compile ACPICA with any levels of
strict-aliasing, set to zero.

generate/unix/Makefile.config

@@ -42,7 +42,7 @@ CWARNINGFLAGS = \
 	-Wformat=2 \
 	-Wmissing-declarations \
 	-Wmissing-prototypes \
-	-Wstrict-aliasing=2 \
+	-Wstrict-aliasing=0 \
 	-Wstrict-prototypes \
 	-Wswitch-default \
 	-Wpointer-arith \
@@ -64,14 +64,13 @@ CWARNINGFLAGS+= \
 	-Wold-style-declaration \
 	-Wold-style-definition \
 	-Wredundant-decls \
+	-Wunreachable-code \
 	-Wtype-limits
 
 #
 # Extra warning flags (possible future use)
 #
 #CWARNINGFLAGS+= \
-#	-Wredundant-decls \
-#	-Wunreachable-code \
 #	-Wcast-qual \
 #	-Wconversion
 #	-Wshadow \