Made emscripten work a bit better

cmake/targets/target-helloworld-emscripten/CMakeLists.txt

@@ -0,0 +1,15 @@
+# Copyright (c) 2023 Dominic Masters
+# 
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+set(DAWN_BUILDING dawnhelloworld CACHE INTERNAL ${DAWN_CACHE_TARGET})
+set(DAWN_BUILD_HOST_LIBS "" CACHE INTERNAL ${DAWN_CACHE_TARGET})
+set(DAWN_TARGET_EMSCRIPTEN true CACHE INTERNAL ${DAWN_CACHE_TARGET})
+set(DAWN_TARGET_GLFW true CACHE INTERNAL ${DAWN_CACHE_TARGET})
+set(DAWN_TARGET_NAME "HelloWorld" CACHE INTERNAL ${DAWN_CACHE_TARGET})
+
+set(DAWN_EMSCRIPTEN_FLAGS "" CACHE INTERNAL ${DAWN_CACHE_TARGET})
+
+# Ensures a .HTML file is generated.
+set(CMAKE_EXECUTABLE_SUFFIX ".html" CACHE INTERNAL ${DAWN_CACHE_TARGET})