build: fix qemuagenttest build with -O0 in fedora 19.

When building libvirt with -O0 flag in fedora 19, it will fail to
generate qemuagenttest, a link error occurs like:

./.libs/libqemumonitortestutils.a(qemumonitortestutils.o): In function `qemuMonitorTestFree':
libvirt/tests/qemumonitortestutils.c:346: undefined reference to `qemuMonitorClose'
./.libs/libqemumonitortestutils.a(qemumonitortestutils.o): In function `qemuMonitorTestNew':
libvirt/tests/qemumonitortestutils.c:870: undefined reference to `qemuMonitorOpen'
collect2: error: ld returned 1 exit status

Fix it by listing libraries in the correct order to avoid lazy linkage.
Signed-off-by: NEric Blake <eblake@redhat.com>

tests/Makefile.am

@@ -417,21 +417,21 @@ qemumonitorjsontest_SOURCES = \
 	testutils.c testutils.h \
 	testutilsqemu.c testutilsqemu.h \
 	$(NULL)
-qemumonitorjsontest_LDADD = $(qemu_LDADDS) libqemumonitortestutils.la
+qemumonitorjsontest_LDADD = libqemumonitortestutils.la $(qemu_LDADDS)
 
 qemuagenttest_SOURCES = \
 	qemuagenttest.c \
 	testutils.c testutils.h \
 	testutilsqemu.c testutilsqemu.h \
 	$(NULL)
-qemuagenttest_LDADD = $(qemu_LDADDS) libqemumonitortestutils.la
+qemuagenttest_LDADD = libqemumonitortestutils.la $(qemu_LDADDS)
 
 qemuhotplugtest_SOURCES = \
 	qemuhotplugtest.c \
 	testutils.c testutils.h \
 	testutilsqemu.c testutilsqemu.h \
 	$(NULL)
-qemuhotplugtest_LDADD = $(qemu_LDADDS) libqemumonitortestutils.la
+qemuhotplugtest_LDADD = libqemumonitortestutils.la $(qemu_LDADDS)
 
 domainsnapshotxml2xmltest_SOURCES = \
 	domainsnapshotxml2xmltest.c testutilsqemu.c testutilsqemu.h \