Update emscripten build to be compatible with new docker image.

cmake/EthCompilerSettings.cmake

@@ -150,7 +150,8 @@ if (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MA
 			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s WASM_ASYNC_COMPILATION=0")
 			# Output a single js file with the wasm binary embedded as base64 string.
 			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s SINGLE_FILE=1")
-
+			# Allow new functions to be added to the wasm module via addFunction.
+			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s ALLOW_TABLE_GROWTH=1")
 			# Disable warnings about not being pure asm.js due to memory growth.
 			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-almost-asm")
 		endif()

libsolc/CMakeLists.txt

@@ -2,7 +2,7 @@ if (EMSCRIPTEN)
 	# Specify which functions to export in soljson.js.
 	# Note that additional Emscripten-generated methods needed by solc-js are
 	# defined to be exported in cmake/EthCompilerSettings.cmake.
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s EXPORTED_FUNCTIONS='[\"_solidity_license\",\"_solidity_version\",\"_solidity_compile\",\"_solidity_alloc\",\"_solidity_free\",\"_solidity_reset\"]' -s RESERVED_FUNCTION_POINTERS=20")
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s EXPORTED_FUNCTIONS='[\"_solidity_license\",\"_solidity_version\",\"_solidity_compile\",\"_solidity_alloc\",\"_solidity_free\",\"_solidity_reset\"]'")
 	add_executable(soljson libsolc.cpp libsolc.h)
 	target_link_libraries(soljson PRIVATE solidity)
 else()

scripts/ci/build_emscripten.sh

@@ -56,8 +56,7 @@ fi
 
 mkdir -p $BUILD_DIR
 cd $BUILD_DIR
-cmake \
-  -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchains/emscripten.cmake \
+emcmake cmake \
   -DCMAKE_BUILD_TYPE=Release \
   -DBoost_USE_STATIC_LIBS=1 \
   -DBoost_USE_STATIC_RUNTIME=1 \