src: Check libvirt_admin.syms for exported symbols

We have this check rule in src/Makefile: check-symfile that
should check if all symbols we wanted to export are exported.
Moreover, if we are not exporting something more. Do the same
with libvirt_admin.syms.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
(cherry picked from commit 74f11dd2)

src/Makefile.am

@@ -486,8 +486,12 @@ if WITH_LINUX
 check-symfile: libvirt.syms libvirt.la
 	$(AM_V_GEN)$(PERL) $(srcdir)/check-symfile.pl libvirt.syms \
 	  .libs/libvirt.so
+check-admin-symfile: libvirt_admin.syms libvirt-admin.la
+	$(AM_V_GEN)$(PERL) $(srcdir)/check-symfile.pl libvirt_admin.syms \
+	  .libs/libvirt-admin.so
 else ! WITH_LINUX
 check-symfile:
+check-admin-symfile:
 endif ! WITH_LINUX
 check-symsorting:
 	$(AM_V_GEN)$(PERL) $(srcdir)/check-symsorting.pl \
@@ -610,7 +614,7 @@ EXTRA_DIST += check-driverimpls.pl check-aclrules.pl check-aclperms.pl
 
 check-local: check-protocol check-symfile check-symsorting \
 	check-drivername check-driverimpls check-aclrules \
-	check-aclperms
+	check-aclperms check-admin-symfile
 .PHONY: check-protocol $(PROTOCOL_STRUCTS:structs=struct)
 
 # Mock driver, covering domains, storage, networks, etc