build: Make building the test binaries optional under Autoconf

Following similar change for Meson.
Allow to save some time packaging and some dependencies.

Signed-off-by: Frediano Ziglio <fziglio@redhat.com>

Makefile.am

@@ -3,8 +3,10 @@ ACLOCAL_AMFLAGS = -I m4
 
 SUBDIRS = subprojects/spice-common server docs tools
 
+if ENABLE_TESTS
 check-valgrind:
 	$(MAKE) -C server check-valgrind
+endif
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = spice-server.pc

configure.ac

@@ -135,6 +135,13 @@ if test "x$have_gstreamer_0_10" = "xyes" || test "x$have_gstreamer_1_0" = "xyes"
     AC_SUBST(ORC_LIBS)
 fi
 
+AC_ARG_ENABLE([tests],
+  AS_HELP_STRING([--enable-tests],
+                 [Enable tests @<:@default=yes@:>@]),
+  [],
+  enable_tests="yes")
+AM_CONDITIONAL(ENABLE_TESTS, test "x$enable_tests" = "xyes")
+
 dnl Check for the presence of Valgrind and do the plumbing to allow
 dnl the running of "make check-valgrind".
 AX_VALGRIND_DFLT(memcheck, on)

server/Makefile.am

@@ -1,8 +1,12 @@
 NULL =
+SUBDIRS =
+
+if ENABLE_TESTS
 SUBDIRS = . tests
 
 check-valgrind:
 	$(MAKE) -C tests check-valgrind
+endif
 
 AM_CPPFLAGS =					\
 	-DSPICE_SERVER_INTERNAL			\