tests: Add SELINUX_LIBS to fix viridentitytest linker bug

In a clean build system (Ubuntu 14.04), the viridentitytest failed to compile.
Even if all the SELINUX libraries and depedencies are installed. See the error
message below:

[...]
  CC       viridentitytest.o
  CCLD     viridentitytest
/usr/bin/ld: viridentitytest.o: undefined reference to symbol
                                                       'security_disable'
//lib/x86_64-linux-gnu/libselinux.so.1: error adding symbols: DSO missing
                                                           from command line
collect2: error: ld returned 1 exit status
make: *** [viridentitytest] Error 1

Simply adding the variable SELINUX_LIBS in viridentitytest rules of
Makefile.am to include SELINUX libraries into viridentitytest solved that
compilation issue.
Signed-off-by: NJulio Faracco <jcfaracco@gmail.com>
Signed-off-by: NEric Blake <eblake@redhat.com>
(cherry picked from commit f2a2d0e9)

tests/Makefile.am

@@ -927,6 +927,7 @@ viridentitytest_SOURCES = \
 	viridentitytest.c testutils.h testutils.c
 viridentitytest_LDADD = $(LDADDS)
 if WITH_SELINUX
+viridentitytest_LDADD += $(SELINUX_LIBS)
 viridentitytest_DEPENDENCIES = libsecurityselinuxhelper.la \
 	../src/libvirt.la
 endif WITH_SELINUX