linux: update to 4.15

linux/PKGBUILD

@@ -5,7 +5,7 @@
 pkgbase=linux               # Build stock -ARCH kernel
 #pkgbase=linux-custom       # Build kernel with a different name
 _srcname=linux
-pkgver=4.15rc8.r104.g1d966eb4d632
+pkgver=4.15.r0.gd8a5b80568a9
 pkgrel=1
 arch=('x86_64')
 url="https://www.kernel.org/"
@@ -20,7 +20,7 @@ source=(
   'linux.preset'   # standard config files for mkinitcpio ramdisk
 )
 sha256sums=('SKIP'
-            'edaf7bebcaf3032e3bf15353e0773e39872c73fc024ca4d23383195a13745b2e'
+            '8e80162a2d8952b7e0a4967647eed940b2b983e950bfe630918bd90cb1107a25'
             'ae2e95db94ef7176207c690224169594d49445e04249d2499e9d2fbc117a0b21'
             '75f99f5239e03238f88d1a834c50043ec32b1dc568f2cc291b07d04718483919'
             'ad6344badc91ad0630caacde83f7f9b97276f80d26a20619a87952be65492c65')
@@ -38,7 +38,6 @@ prepare() {
 
   # add upstream patch
   #patch -p1 -i ../patch-${pkgver}
-  chmod +x tools/objtool/sync-check.sh  # GNU patch doesn't support git-style file mode
 
   # security patches