Add SPIR-V 1.2 support, for OpenCL 2.2
diff --git a/source/table.cpp b/source/table.cpp
index 8f85802..b8fb809 100644
--- a/source/table.cpp
+++ b/source/table.cpp
@@ -28,6 +28,7 @@
     case SPV_ENV_OPENGL_4_2:
     case SPV_ENV_OPENGL_4_3:
     case SPV_ENV_OPENGL_4_5:
+    case SPV_ENV_UNIVERSAL_1_2:
       break;
     default:
       return nullptr;