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js: Enable STRICT_JS in Emscripten

This turns on "use strict" in JavaScript, which enforces declaring
variables among other things, and may allow better optimisations.

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

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

@@ -37,7 +37,8 @@

 set(CMAKE_C_LINK_FLAGS "\

 -s ALLOW_MEMORY_GROWTH=1 \

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

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

+-s EXTRA_EXPORTED_RUNTIME_METHODS='[cwrap,callMain]' \

+-s STRICT_JS=1")

 if(WASM)

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

 else()