Run tests using parallel make (reducing build time)

appveyor/do.py

@@ -537,7 +537,7 @@ def build(args):
 def test(args):
     setup_for_build(args)
     print('{0}Running the main module tests{1}'.format(ANSI_YELLOW, ANSI_RESET))
-    call_make(['tapfiles'], parallel=0)
+    call_make(['tapfiles'])
     call_make(['test-results'], parallel=0, silent=True)
 
 def doExec(args):

travis/build.sh

@@ -35,7 +35,7 @@ ret=0
 
 if [ "$TEST" != "NO" ]
 then
-  make tapfiles || ret=$?
+  make -j2 tapfiles || ret=$?
 
   make -sk test-results
 fi