tests: domaincaps: Fix build when WITH_QEMU is disabled

doTestQemuInternal and doTestQemu are used only when WITH_QEMU is
enabled.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>

tests/domaincapstest.c

@@ -266,6 +266,9 @@ test_virDomainCapsFormat(const void *opaque)
     return ret;
 }
 
+
+#if WITH_QEMU
+
 static int
 doTestQemuInternal(const char *version,
                    const char *machine,
@@ -349,6 +352,8 @@ doTestQemu(const char *inputDir G_GNUC_UNUSED,
     return 0;
 }
 
+#endif
+
 static int
 mymain(void)
 {