Fix broken DebugOpt build on linux

.github/workflows/llvm.yml

@@ -10,7 +10,7 @@ jobs:
       matrix:
         os: [ubuntu-22.04, macos-13]
         platform: [x64, arm64]
-        build-cfg: [Debug, Release]
+        build-cfg: [Debug, RelWithDebInfo, Release]
 
     runs-on: ${{ matrix.os }}
 

build/llvm/LLVM.lua

@@ -142,7 +142,7 @@ end
 
 function get_llvm_configuration_name(debug)
 	if string.find(_OPTIONS["configuration"], "DebugOpt") then
-		return os.istarget("windows") and "RelWithDebInfo" or "Release"
+		return "RelWithDebInfo"
 	end
 	if string.find(_OPTIONS["configuration"], "Debug") then
 		return "Debug"