user/mesa: bump to 18.1.8, LLVM 6

user/mesa/APKBUILD

 # Maintainer: A. Wilcox <awilfox@adelielinux.org>
 pkgname=mesa
-pkgver=18.1.7
+pkgver=18.1.8
 pkgrel=0
 pkgdesc="Mesa DRI OpenGL library"
 url="https://www.mesa3d.org"
@@ -17,7 +17,7 @@ subpackages="$pkgname-dev
 	$pkgname-xatracker $pkgname-osmesa $pkgname-gbm
 	$pkgname-libwayland-egl:_wayland
 	"
-_llvmver=4
+_llvmver=6
 depends_dev="libdrm-dev dri2proto libxext-dev libxdamage-dev libxcb-dev glproto
 	dri3proto presentproto libxshmfence-dev"
 makedepends="$depends_dev expat-dev xextproto libxt-dev makedepend py3-mako
@@ -245,7 +245,7 @@ _wayland() {
 		|| return 1
 }
 
-sha512sums="697c4f441ae52bc867d9d73b103094a29102168c248a502c4ea0fc48f51bcb86b2e741da39e882f24131326d460cdb1416415604c6994d1b8c09fb8a153a5c77  mesa-18.1.7.tar.xz
+sha512sums="ab89c6d27b765d3efdf61b24dc56d863ae590d83003d2eae4bfe25ecfbeda5bee0227f21d057523bb4eceeaf3d9955df48087ffb472c41b123c100e593056cb9  mesa-18.1.8.tar.xz
 c3d4804ebc24c7216e4c9d4995fb92e116be7f478024b44808ee134a4c93bb51d1f66fe5fb6eca254f124c4abf6f81272b027824b3e2650a9607818bf793035a  glx_ro_text_segm.patch
 9f7a050f09571a2b17098d495b82e2e85b293fb7285e7d6d7c3c48cd4220a1bdcc61a7321ba78dd14860939ecabe7e89b32d6110f3728f793273e1e26b78a553  musl-fixes.patch
 c7d91a660a033df91fac9c557039efc8669f0c26b2d35997d50753938b70d1af0bd110dcab3f8236eafab7d4be5dd7cd128a3e057e67e7e6a38a73fd6a7ef62e  musl-fix-includes.patch