set a sane PATH for the install scriptlet

Hopefully this prevents people from shooting themselves in the face
when they, or something else, decides that /sbin doesn't belong here.

linux.install

@@ -4,6 +4,9 @@
 KERNEL_NAME=
 KERNEL_VERSION=3.4.2-2-ARCH
 
+# set a sane PATH to ensure that critical utils like depmod will be found
+export PATH='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'
+
 post_install () {
   # updating module dependencies
   echo ">>> Updating module dependencies. Please wait ..."