Massive conversion from Package to AutotoolsPackage (#2845)

* Massive conversion from Package to AutotoolsPackage

* Forgot to convert p4est to AutotoolsPackage

* Fix typo

* Fix broken link in docs

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

@@ -26,7 +26,7 @@
 from spack import *
 
 
-class Libgd(Package):
+class Libgd(AutotoolsPackage):
     """GD is an open source code library for the dynamic creation of images
        by programmers. GD is written in C, and "wrappers" are available
        for Perl, PHP and other languages. GD creates PNG, JPEG, GIF,
@@ -55,7 +55,7 @@ class Libgd(Package):
     depends_on('libtiff')
     depends_on('fontconfig')
 
-    def install(self, spec, prefix):
+    def autoreconf(self, spec, prefix):
         autoreconf("--install", "--force",
                    "-I", "m4",
                    "-I", join_path(spec['gettext'].prefix,
@@ -67,6 +67,3 @@ def install(self, spec, prefix):
                    "-I", join_path(spec['libtool'].prefix,
                                    "share", "aclocal")
                    )
-        configure('--prefix={0}'.format(prefix))
-        make()
-        make("install")