patch 8.0.1629: Mac: getpagesize() is deprecated

Problem:    Mac: getpagesize() is deprecated.
Solution:   Use sysconf() instead. (Ozaki Kiichi, closes #2741)

src/os_unix.c

@@ -603,7 +603,7 @@ mch_total_mem(int special UNUSED)
 #  ifdef MAC_OS_X_VERSION_10_9
 					    + vm_stat.compressor_page_count
 #  endif
-					    ) * getpagesize();
+					    ) * sysconf(_SC_PAGESIZE);
 	mach_port_deallocate(mach_task_self(), host);
     }
 # endif

src/version.c

@@ -766,6 +766,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1629,
 /**/
     1628,
 /**/