Projects: Fix CMake example project (#4332)

* Update CMakeLists.txt

Add missing link flags

* Update README.md

Remove unneeded flag because this flag is defined in the updated CMakeList file

* Update CMakeLists.txt

projects/CMake/CMakeLists.txt

@@ -30,8 +30,8 @@ target_link_libraries(${PROJECT_NAME} raylib)
 
 # Web Configurations
 if (${PLATFORM} STREQUAL "Web")
-    # Tell Emscripten to build an example.html file.
-    set_target_properties(${PROJECT_NAME} PROPERTIES SUFFIX ".html")
+    set_target_properties(${PROJECT_NAME} PROPERTIES SUFFIX ".html") # Tell Emscripten to build an example.html file.
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -s USE_GLFW=3 -s ASSERTIONS=1 -s WASM=1 -s ASYNCIFY -s GL_ENABLE_GET_PROC_ADDRESS=1")
 endif()
 
 # Checks if OSX and links appropriate frameworks (Only required on MacOS)

projects/CMake/README.md

@@ -22,6 +22,6 @@ Compiling for the web requires the [Emscripten SDK](https://emscripten.org/docs/
 ``` bash
 mkdir build
 cd build
-emcmake cmake .. -DPLATFORM=Web -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXE_LINKER_FLAGS="-s USE_GLFW=3" -DCMAKE_EXECUTABLE_SUFFIX=".html"
+emcmake cmake .. -DPLATFORM=Web -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXECUTABLE_SUFFIX=".html"
 emmake make
-```
+```