Add universal build_type variant to CMakePackage (#4797)

* Add universal build_type variant to CMakePackage
* Override build_type in some packages with different possible values
* Remove reference to no longer existent debug variant
* Update CBTF packages with new build_type variant
* Keep note on build size of LLVM

var/spack/repos/builtin/packages/sas/package.py

@@ -36,19 +36,10 @@ class Sas(CMakePackage):
     version('0.1.4', '20d7311258f2a59c9367ae1576c392b6')
     version('0.1.3', '1e6572afcc03318d16d7321d40eec0fd')
 
-    variant('debug', default=False, description='Build debug version')
-
     depends_on('python@2.7:')
     depends_on('llvm@3.5:')
     depends_on('cmake@2.8:', type='build')
 
-    def build_type(self):
-        spec = self.spec
-        if '+debug' in spec:
-            return 'Debug'
-        else:
-            return 'Release'
-
     def cmake_args(self):
         args = [
             '-DLLVM_DEV_DIR=%s' % self.spec['llvm'].prefix