Merge pull request swiftlang#4899 from kateinoigakukun/pr-f57925e663dfa963eeb242915a3ea289b3211842

[wasm] Include syslog.h only if available

Author: kateinoigakukun

CoreFoundation/URL.subproj/CFURL.c

@@ -31,7 +31,7 @@
 #include <sys/types.h>
 #if __has_include(<sys/syslog.h>)
 #include <sys/syslog.h>
-#else
+#elif __has_include(<syslog.h>)
 #include <syslog.h>
 #endif
 #include <CoreFoundation/CFURLPriv.h>