Build RADV with LLVM static libs

Build RADV with LLVM static libs

This was done using:
LLVM from padoka PPA: llvm-5.0-dev                                    1:5.0~svn303494-0~x~padoka0

First, I needed to patch configure.ac to get the static libraries for LLVM:

diff --git a/configure.ac b/configure.ac
index 5caf316..7bf0fd9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2585,7 +2585,7 @@ if test "x$enable_llvm" = xyes; then
         dnl We need to link to llvm system libs when using static libs
         dnl However, only llvm 3.5+ provides --system-libs
         if test $LLVM_VERSION_MAJOR -ge 4 -o $LLVM_VERSION_MAJOR -eq 3 -a $LLVM_VERSION_MINOR -ge 5; then
-            LLVM_LIBS="$LLVM_LIBS `$LLVM_CONFIG --system-libs`"
+            LLVM_LIBS="`$LLVM_CONFIG --libs --link-static` `$LLVM_CONFIG --system-libs --link-static`"
         fi
     fi
 fi

Run autogen.sh, then:
./configure --prefix=/home/dang/install/radv --enable-texture-float --enable-dri3 --enable-glx-tls --with-vulkan-drivers=radeon --with-dri-drivers=radeon --with-gallium-drivers=radeonsi --with-llvm-prefix=/usr/lib/llvm-5.0 --enable-debug=no --enable-llvm-shared-libs=no