Build llvm 10.0.0_3 for Darwin universal package

Author: bcardiff

omnibus/config/projects/llvm.rb

@@ -6,7 +6,7 @@
 build_version do
   source :version, from_dependency: 'llvm'
 end
-build_iteration 1
+build_iteration 3
 
 def valid_cmake_version?
   `cmake --version` =~ /cmake version (\d+\.)(\d+\.)(\d)/

omnibus/config/software/llvm.rb

@@ -33,6 +33,7 @@
   mkdir llvm_build_dir
   command "cmake" \
     " -DCMAKE_BUILD_TYPE=MinSizeRel" \
+    " -DCMAKE_OSX_ARCHITECTURES=\"arm64;x86_64\"" \
     " -DLLVM_TARGETS_TO_BUILD=\"X86;AArch64\"" \
     " -DLLVM_ENABLE_TERMINFO=OFF" \
     " -DLLVM_ENABLE_FFI=OFF" \