macOS compilation fix

[gkorovkin]

Hi William! Got two issue around with macOS builds - just want share with you

1. Removing old macros definition for higher OpenSSL version (MacOS mostly-didn't check it under linux compilation yet) - we got that macros defined in openssl library at least for macports version

diff --git a/src/ptclib/pssl.cxx b/src/ptclib/pssl.cxx
index 6ef2ecb..1a6cda7 100644
--- a/src/ptclib/pssl.cxx
+++ b/src/ptclib/pssl.cxx
@@ -670,7 +670,7 @@ PSSLDiffieHellman::~PSSLDiffieHellman()
     DH_free(dh);
 }
 
-#ifdef P_d2i_DHparams_bio_OLD
+#if defined(P_d2i_DHparams_bio_OLD) && OPENSSL_VERSION_NUMBER < 0x100020efL
 // 2/21/04 Yuri Kiryanov - fix for compiler choke on BeOS for usage of
 // SSL function d2i_DHparams_bio below in PSSLDiffieHellman::Load
 // 5/26/06 Hannes Friederich - Mac OS X seems to need that fix too...

2. And the second one(oldest) pthread_yield is not here

diff --git a/src/ptlib/unix/tlibthrd.cxx b/src/ptlib/unix/tlibthrd.cxx
index 4a30dd0..8402cd7 100644
--- a/src/ptlib/unix/tlibthrd.cxx
+++ b/src/ptlib/unix/tlibthrd.cxx
@@ -1534,7 +1534,11 @@ PTimedMutex::~PTimedMutex()
     for (PINDEX i = 0; i < 100; ++i) {
       if ((result = pthread_mutex_destroy(&m_mutex)) != EBUSY)
         break;
+#ifdef __MACH__
+      sched_yield();
+#else
       pthread_yield();
+#endif
     }
   }

Also it's an issue with installing version.h file under macOS - but emacs ruined all tabs/spaces in Makefile.in so the diff it's just uninformative - will send a bit later

[willamowius]

Both patches applied. Thanks!