Add my_getpagesize.c as source for mysys

mysys/CMakeLists.txt

@@ -26,4 +26,4 @@ ADD_LIBRARY(mysys array.c charset-def.c charset.c checksum.c default.c default_m
 				my_static.c my_symlink.c my_symlink2.c my_sync.c my_thr_init.c my_wincond.c
 				my_windac.c my_winsem.c my_winthread.c my_write.c ptr_cmp.c queues.c
 				rijndael.c safemalloc.c sha1.c string.c thr_alarm.c thr_lock.c thr_mutex.c
-				thr_rwlock.c tree.c typelib.c my_vle.c base64.c my_memmem.c)
+				thr_rwlock.c tree.c typelib.c my_vle.c base64.c my_memmem.c my_getpagesize.c)