Fixed build error on mingw

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@345 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjlib/build/os-win32.mak b/pjlib/build/os-win32.mak
index 1b46e46..b495bb2 100644
--- a/pjlib/build/os-win32.mak
+++ b/pjlib/build/os-win32.mak
@@ -9,7 +9,7 @@
 #
 export PJLIB_OBJS += 	addr_resolv_sock.o guid_win32.o  \
 			log_writer_stdout.o os_core_win32.o \
-			os_error_win32.o os_time_ansi.o os_timestamp_common.o \
+			os_error_win32.o os_time_bsd.o os_timestamp_common.o \
 			os_timestamp_win32.o \
 			pool_policy_malloc.o sock_bsd.o sock_select.o