Remove duplicate EXIT_RUNTIME flag (#358)

Author: mcbarton

test/CMakeLists.txt

@@ -72,7 +72,6 @@ if(EMSCRIPTEN)
         PUBLIC "SHELL: -s WASM_BIGINT"
         PUBLIC "SHELL: -s ASSERTIONS=0"
         PUBLIC "SHELL: -s ALLOW_MEMORY_GROWTH=1"
-        PUBLIC "SHELL: -s EXIT_RUNTIME=1"
         PUBLIC "SHELL: -s STACK_SIZE=32mb"
         PUBLIC "SHELL: -s INITIAL_MEMORY=128mb"
         PUBLIC "SHELL: --preload-file ${ESCAPED_SYSROOT_PATH}/include@/include"