move id check to lib.sh too

doesn't really matter, it's just an extra layer to ensure
reliability, but "id" is pretty standard

Signed-off-by: Leah Rowe <leah@libreboot.org>

build

@@ -22,7 +22,6 @@ linkname="${linkpath##*/}"
 
 main()
 {
-	x_ id -u 1>/dev/null 2>/dev/null
 	[ $# -lt 1 ] && badcmd
 	spath="script/$1"
 

include/lib.sh

@@ -61,6 +61,7 @@ install_packages()
 }
 [ $# -gt 0 ] && [ "$1" = "dependencies" ] && install_packages $@ && return 0
 
+id -u 1>/dev/null 2>/dev/null || $err "suid check failed (id -u)"
 [ "$(id -u)" != "0" ] || $err "this command as root is not permitted"
 
 # if "y": a coreboot target won't be built if target.cfg says release="n"