chromium: fix gcc8 alignof issue on i686 (via Fedora)

srcpkgs/chromium/patches/gcc8-alignof.patch

@@ -0,0 +1,17 @@
+--- mojo/public/c/system/macros.h.orig	2018-09-06 10:11:54.336432699 -0400
++++ mojo/public/c/system/macros.h	2018-09-06 10:13:56.555727572 -0400
+@@ -27,7 +27,13 @@
+   (sizeof(void*) == 4 ? 32 : 0)
+ 
+ // Like the C++11 |alignof| operator.
+-#if __cplusplus >= 201103L
++#if defined(__GNUC__) && __GNUC__ >= 8
++// GCC 8 has changed the alignof operator to return the minimal alignment
++// required by the target ABI, instead of the preferred alignment.
++// This means that on 32-bit x86, it will return 4 instead of 8.
++// Use __alignof__ instead to avoid this.
++#define MOJO_ALIGNOF(type) __alignof__(type)
++#elif __cplusplus >= 201103L
+ #define MOJO_ALIGNOF(type) alignof(type)
+ #elif defined(__GNUC__)
+ #define MOJO_ALIGNOF(type) __alignof__(type)

srcpkgs/chromium/template

@@ -18,10 +18,6 @@ nopie=yes  # contains tools that are not PIE, enables PIE itself
 build_options="clang"
 desc_option_clang="Use clang to build"
 
-case $XBPS_TARGET_MACHINE in
-	i686) build_options_default+=" clang" ;;
-esac
-
 hostmakedepends="$(vopt_if clang clang) yasm python pkg-config perl gperf bison ninja nodejs hwids
  libatomic-devel libevent-devel libglib-devel"
 makedepends="libpng-devel gtk+-devel gtk+3-devel nss-devel pciutils-devel