Restore correct source location for <sys/capability.h>

Reported-by: Robby Workman <rworkman@slackware.com>
Signed-off-by: Andrew G. Morgan <morgan@kernel.org>
diff --git a/libcap/Makefile b/libcap/Makefile
index da22bd1..2d95e69 100644
--- a/libcap/Makefile
+++ b/libcap/Makefile
@@ -37,7 +37,7 @@
 
 cap_names.sed: Makefile $(KERNEL_HEADERS)/linux/capability.h
 	@echo "=> making cap_names.c from <linux/capability.h>"
-	@sed -ne '/^#define[ \t]CAP[_A-Z]\+[ \t]\+[0-9]\+/{s/^#define \([^ \t]*\)[ \t]*\([^ \t]*\)/\{\"\1\",\2\},/;y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/;p;}' < $(KERNEL_HEADERS)/linux/capability.h | fgrep -v 0x > $@
+	sed -ne '/^#define[ \t]CAP[_A-Z]\+[ \t]\+[0-9]\+/{s/^#define \([^ \t]*\)[ \t]*\([^ \t]*\)/\{\"\1\",\2\},/;y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/;p;}' < $(KERNEL_HEADERS)/linux/capability.h | fgrep -v 0x > $@
 
 $(STALIBNAME): $(OBJS)
 	$(AR) rcs $@ $^