base-files: taint the build if the override mechanism is used

If some packages are overridden (using ./scripts/feeds -f), add a new
taint flag in /etc/openwrt_release. We'll use the CONFIG_OVERRIDE_PKGS
variable reported through the .config to detect it.

Signed-off-by: Mathieu Olivari <mathieu@qca.qualcomm.com>

SVN-Revision: 44337

include/version.mk

@@ -58,6 +58,7 @@ VERSION_TAINT_SPECS := \
 	+USE_EGLIBC:eglibc \
 	+USE_MKLIBS:mklibs \
 	+BUSYBOX_CUSTOM:busybox \
+	+OVERRIDE_PKGS:override \
 
 VERSION_TAINTS := $(strip $(foreach taint,$(VERSION_TAINT_SPECS), \
 	$(if $(findstring +,$(taint)), \