Added customization for make targets in 'build' and 'install' phases for AutotoolsPackage (#2464)

* Customization for make targets in build and test phases for AutotoolsPackage

* Updated Blitz++ to use customized make build and test targets

* Removed flake8 error

* Removed make test customization, added make install customization, need to figure out issues with multiple make targets

* Changed build_targets and install_targets to normal attributes

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

@@ -31,3 +31,9 @@ class Blitz(AutotoolsPackage):
     url = "https://github.com/blitzpp/blitz/tarball/1.0.0"
 
     version('1.0.0', '9f040b9827fe22228a892603671a77af')
+
+    build_targets = ['lib']
+
+    def check(self):
+        make('check-testsuite')
+        make('check-examples')