Fix compilation issue caused by #23 #737

Job	Run time
Build framework (macos-release-availability, -sdk macosx -configuration Release OTHER_CFLAGS='$...	18m 35s
Build framework (ios-release, -sdk iphoneos -configuration Release OTHER_CFLAGS='${inherited} -We...	7m 56s
Build framework (ios-debug, -sdk iphoneos -configuration Debug OTHER_CFLAGS='${inherited} -Werr...	8m 15s
Build framework (tvos-debug, -sdk appletvos -configuration Debug OTHER_CFLAGS='${inherited} -Wer...	8m 6s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	29m 15s
Build framework (watchos-debug, -sdk watchos -configuration Debug OTHER_CFLAGS='${inherited} -...	13m 0s
Build TV Casting Bridge example	14m 5s
Run framework tests (asan-global-storage, -enableAddressSanitizer YES -enableUndefinedBehaviorSan...	26m 29s
Run framework tests (tsan, -enableThreadSanitizer YES)	27m 26s
Build Darwin	2s
	2h 33m 9s

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