Support selecting JavaScriptCore API version #153

Job	Run time
test (macos-latest, clang, clang++, static, JavaScriptCore)	35s
test (macos-latest, clang, clang++, shared, JavaScriptCore)	28s
test (macos-latest, clang, clang++, shared, V8)	27s
test (ubuntu-latest, clang, clang++, static, JavaScriptCore, 4.0, -DINCLUDEJS_BACKEND_JAVASCRIPTC...	18s
test (ubuntu-latest, gcc, g++, static, JavaScriptCore, 4.0, -DINCLUDEJS_BACKEND_JAVASCRIPTCORE_AP...	17s
test (ubuntu-latest, clang, clang++, shared, JavaScriptCore, 4.0, -DINCLUDEJS_BACKEND_JAVASCRIPTC...	20s
test (ubuntu-latest, gcc, g++, shared, JavaScriptCore, 4.0, -DINCLUDEJS_BACKEND_JAVASCRIPTCORE_AP...	21s
test (ubuntu-latest, clang, clang++, static, JavaScriptCore, 6.0, -DINCLUDEJS_BACKEND_JAVASCRIPTC...	57s
test (ubuntu-latest, gcc, g++, static, JavaScriptCore, 6.0, -DINCLUDEJS_BACKEND_JAVASCRIPTCORE_AP...	54s
test (ubuntu-latest, clang, clang++, shared, JavaScriptCore, 6.0, -DINCLUDEJS_BACKEND_JAVASCRIPTC...	52s
test (ubuntu-latest, gcc, g++, shared, JavaScriptCore, 6.0, -DINCLUDEJS_BACKEND_JAVASCRIPTCORE_AP...	20s
test (ubuntu-latest, clang, clang++, static, -DINCLUDEJS_ADDRESS_SANITIZER:BOOL=ON, JavaScriptCore)	6s
test (ubuntu-latest, clang, clang++, static, -DINCLUDEJS_UNDEFINED_SANITIZER:BOOL=ON, JavaScriptC...	7s
test (macos-latest, clang, clang++, static, -DINCLUDEJS_ADDRESS_SANITIZER:BOOL=ON, JavaScriptCore)	27s
test (macos-latest, clang, clang++, static, -DINCLUDEJS_UNDEFINED_SANITIZER:BOOL=ON, JavaScriptCore)	29s
	6m 58s

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