OPENSSL_isservice() is defined on all platforms.

crypto/crypto.h

@@ -521,9 +521,7 @@ void OpenSSLDie(const char *file,int line,const char *assertion);
 
 unsigned long *OPENSSL_ia32cap_loc(void);
 #define OPENSSL_ia32cap (*(OPENSSL_ia32cap_loc()))
-#ifdef OPENSSL_SYS_WIN32
 int OPENSSL_isservice(void);
-#endif
 
 /* BEGIN ERROR CODES */
 /* The following lines are auto generated by the script mkerr.pl. Any changes