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js: Add a CMake variable to control whether Emscripten emits WASM

I've finally got bored of keeping (and occasionally losing) a patch
that turns it off unconditionally.

--- a/cmake/platforms/emscripten.cmake

+++ b/cmake/platforms/emscripten.cmake

@@ -3,6 +3,9 @@

 set(platform_libs)

 set(CMAKE_EXECUTABLE_SUFFIX ".js")

+set(WASM ON

+  CACHE BOOL "Compile to WebAssembly rather than plain JavaScript")

+

 set(emcc_export_list

   # Event handlers for mouse and keyboard input

   _mouseup

@@ -33,6 +36,11 @@

 -s ALLOW_MEMORY_GROWTH=1 \

 -s EXPORTED_FUNCTIONS='[${emcc_export_string}]' \

 -s EXTRA_EXPORTED_RUNTIME_METHODS='[cwrap,callMain]'")

+if(WASM)

+  set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -s WASM=1")

+else()

+  set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -s WASM=0")

+endif()

 set(build_cli_programs FALSE)

 set(build_gui_programs FALSE)