Improve & cleanup makefile

3 jobs for master in 7 minutes and 11 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Test
failed #30099
backend

00:03:33

passed #30100
frontend

00:02:34

passed #30101
stats

00:01:02

 
Name Stage Failure
failed
backend Test
Error [Clean.Parse.dcl,12]: hashtable.dcl could not be imported
Error [Clean.Parse.dcl,13]: Heap.dcl could not be imported
Error [Cloogle.DB.Factory.icl,57]: compile.dcl could not be imported
Error [Cloogle.DB.Factory.icl,59]: predef.dcl could not be imported
Compiling builddb
Compiling Cloogle.DB.Factory
make: *** [builddb] Error 1
Makefile:27: recipe for target 'builddb' failed
ERROR: Job failed: exit code 1