[wip/libpointmatcher] use CLOCK_PROF on NetBSD

libpointmatcher/distinfo

 SHA1 (libpointmatcher-1.1.0.tar.gz) = 49ae5a799f90bd8f381d0a0a444465ad35c1e64b
 RMD160 (libpointmatcher-1.1.0.tar.gz) = dd9dfb488f44ca7d5231ce7f80b5b408f6e42269
 Size (libpointmatcher-1.1.0.tar.gz) = 1849742 bytes
+SHA1 (patch-aa) = 1fdeea52150e0879db0cf245b704db70fcc341d0

libpointmatcher/patches/patch-aa

+diff --git pointmatcher/Timer.cpp pointmatcher/Timer.cpp
+index cdd18da..ba2a3a6 100644
+--- pointmatcher/Timer.cpp
++++ pointmatcher/Timer.cpp
+@@ -68,7 +68,11 @@ namespace PointMatcherSupport
+ 		return Time(now.tv_sec) * Time(1000000000) + Time(now.tv_nsec);
+ 		#else // __MACH__
+ 		struct timespec ts;
++		#ifdef __NetBSD__
++		clock_gettime(CLOCK_PROF, &ts);
++		#else
+ 		clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
++		#endif
+ 		return Time(ts.tv_sec) * Time(1000000000) + Time(ts.tv_nsec);
+ 		#endif // __MACH__
+ 	}