Improve patching step

PKGBUILD

@@ -24,12 +24,15 @@ prepare() {
 
   cd linux
 
-  # apply patches
-  for _f in "${source[@]}"; do
-    if [[ "$_f" =~ \.patch$ ]]; then
-      msg2 "Patching $_f"
-      patch -p1 < "$srcdir/$_f"
-    fi
+
+  # apply patch from the source array (should be a pacman feature)
+  local src
+  for src in "${source[@]}"; do
+    src="${src%%::*}"
+    src="${src##*/}"
+    [[ $src = *.patch ]] || continue
+    msg2 "Applying patch $src..."
+    patch -Np1 < "../$src"
   done
 
   # loading default config