build: src: fix libtool dependency issue

Libtool gets a wrong order of arguments of libraries to install and it
fails when installing libvirt-admin.so that libvirt.so is not yet
installed.  Caused by commit <3097282d>.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

src/Makefile.am

@@ -100,6 +100,10 @@ COMMON_UNIT_VARS = \
 	-e 's|[@]sysconfdir[@]|$(sysconfdir)|g' \
 	$(NULL)
 
+# Set these variables before we include any of the subdirs as libvirt-admin.la
+# has to be installed after libvirt.la.
+lib_LTLIBRARIES += libvirt.la libvirt-qemu.la libvirt-lxc.la
+
 include util/Makefile.inc.am
 include conf/Makefile.inc.am
 include cpu/Makefile.inc.am
@@ -146,8 +150,6 @@ SECDRIVER_LIBS += $(APPARMOR_LIBS)
 endif WITH_SECDRIVER_APPARMOR
 
 
-lib_LTLIBRARIES += libvirt.la libvirt-qemu.la libvirt-lxc.la
-
 moddir = $(libdir)/libvirt/connection-driver
 
 confdir = $(sysconfdir)/libvirt