Bug#37003: Tests sporadically crashes with embedded server

Post-merge fix: Alter linking order so that the thread linking
flags appear last in the list. This needs to be done this way
because some linkers will not search the thread archive again
if a undefined symbol (pthread_kill in this case) appears later.

client/Makefile.am

@@ -88,11 +88,12 @@ mysqlslap_LDADD =		$(CXXLDFLAGS) $(CLIENT_THREAD_LIBS) \
 
 mysqltest_SOURCES=		mysqltest.c
 mysqltest_CFLAGS=		-DTHREAD -UUNDEF_THREADS_HACK
-mysqltest_LDADD =		$(CXXLDFLAGS) $(CLIENT_THREAD_LIBS) \
+mysqltest_LDADD =		$(CXXLDFLAGS) \
 				@CLIENT_EXTRA_LDFLAGS@ \
 				$(LIBMYSQLCLIENT_LA) \
 				$(top_builddir)/mysys/libmysys.a \
-				$(top_builddir)/regex/libregex.a
+				$(top_builddir)/regex/libregex.a \
+				$(CLIENT_THREAD_LIBS)
 
 mysql_upgrade_SOURCES=          mysql_upgrade.c \
                                 $(top_srcdir)/mysys/my_getpagesize.c