SourceKit: the swift-lang requires the standard library

The swift-lang swift module requires the standard library to be built and is
part of the standard library component.  Ensure that this is taken into
consideration when we attempt to build it.

Author: compnerd

tools/SourceKit/tools/swift-lang/CMakeLists.txt

@@ -1,4 +1,4 @@
-if(NOT SWIFT_SOURCEKIT_USE_INPROC_LIBRARY)
+if(NOT SWIFT_SOURCEKIT_USE_INPROC_LIBRARY AND SWIFT_BUILD_STDLIB)
   set(EXTRA_COMPILE_FLAGS "-F" "${SWIFT_LIBRARY_OUTPUT_INTDIR}")
   set(SOURCEKITD_LINK_LIBS sourcekitd)
   set(INSTALLED_COMP sourcekit-xpc-service)
@@ -13,10 +13,9 @@ if(NOT SWIFT_SOURCEKIT_USE_INPROC_LIBRARY)
     UIDs.swift.gyb
 
     DEPENDS ${DEPENDS_LIST}
-    SWIFT_MODULE_DEPENDS_OSX Darwin
     PRIVATE_LINK_LIBRARIES ${SOURCEKITD_LINK_LIBS}
     SWIFT_COMPILE_FLAGS ${EXTRA_COMPILE_FLAGS}
     INSTALL_IN_COMPONENT ${INSTALLED_COMP}
     TARGET_SDKS ${SOURCEKIT_DEFAULT_TARGET_SDK}
     IS_STDLIB)
-endif()
+endif()