Update to Linux Kernel 4.12.4 (#285)

This updates the linux-postmarketos kernel to 4.12.4, and fixes an issue
where the APKBUILD was pulling down the 4.12 source but not the 4.12.x
patches. I think that pulling down the major.minor source and a sep.
package for patches to update to the major.minor.minor(er?) release adds
unnecessary complexity since kernel.org already hosts the sources with
these patches applied (e.g. in this case the 4.12.4 source)

aports/main/linux-postmarketos/APKBUILD

@@ -13,12 +13,9 @@ _config="config-${_flavor}.${CARCH}"
 
 pkgname=linux-${_flavor}
 
-pkgver=4.12.3
-case $pkgver in
-	*.*.*)  _kernver=${pkgver%.*};;
-	*.*) _kernver=$pkgver;;
-esac
-pkgrel=2
+pkgver=4.12.4
+_kernver=${pkgver}
+pkgrel=1
 
 arch="all"
 pkgdesc="Mainline Linux for pmOS supported chipsets (OMAP)"
@@ -177,6 +174,6 @@ dev() {
 		"$subpkgdir"/lib/modules/${_abi_release}/build
 }
 
-sha512sums="8e81b41b253e63233e92948941f44c6482acb52aa3a3fd172f03a38a86f2c35b2ad4fd407acd1bc3964673eba344fe104d3a03e3ff4bf9cd1f22bd44263bd728  linux-4.12.tar.xz
+sha512sums="beb3c7644f12925301aedcc0cfc347cd086ce0486d3a4fe5a59fd4e00452c5495cec1eb7a294b83bd0d4a55238077d0b3766824b70e92e9b211b3f3146b6cc68  linux-4.12.4.tar.xz
 3f4435ce0cf227e4ba64aa7153c913370c53069e34a376e453786d601b5a73706a3f44b002fab1b10a72dc94e896c1d8fb462c2b78e62ed69c468d98aa7220da  config-postmarketos.armhf
 c2bdaf8885dab4c3d3f96d856179138fed2d33cadcb9b33997238c8395a13eb8cb2b35f5f887339c5b47b34c8aa1bcd121059987601c1908103b66c23da478f0  config-postmarketos.x86_64"