net/mpd5: unbreak build for GCC (powerpc64)

Unbreak package build for GCC-based arches
adding r2412 and r2414 from upstream.
No PORTREVISION bump.

net/mpd5/files/patch-ppp.h

@@ -0,0 +1,27 @@
+Index: src/ppp.h
+===================================================================
+--- src/ppp.h	(revision 2411)
++++ src/ppp.h	(working copy)
+@@ -69,20 +69,15 @@
+   #define assert(e)	((e) ? (void)0 : DoAssert(__FILE__, __LINE__, #e))
+ 
+ #ifdef __clang__
+-
++#ifndef NO_THREAD_SAFETY_ANALYSIS
+ #ifndef THREAD_ANNOTATION_ATTRIBUTE__
+   #define THREAD_ANNOTATION_ATTRIBUTE__(x)   __attribute__((x))
+-#else
+-  #define THREAD_ANNOTATION_ATTRIBUTE__(x)
+ #endif
+-
+-#ifndef NO_THREAD_SAFETY_ANALYSIS
+   #define NO_THREAD_SAFETY_ANALYSIS \
+ 	THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
++#endif
+ #else
+   #define NO_THREAD_SAFETY_ANALYSIS
+-#endif
+-
+ #endif /* __clang__ */
+ 
+   /* Giant Mutex handling */