Add a new package for IcedTea (#4804)

* alsa-lib: new package

* cups: new package

* icedtea: new package

* icedtea: adding JAVA_HOME variable

* alsa: removing placeholder

* icedtea: typo fix

* alsa: fixing formattting

* icedtea: formatting fixes and cleanup

* icedtea: additional cleanup

* jdk: adding provides('java') to jdk, setting jdk to default java.

* icedtea: adding jdk as a dependency

* java: changing depends_on('jdk') and similar entries to depends_on('java')

* icedtea: removing unused imports, trying to placate flake8.

* fastqc: fixing flake8 error

* bazel: fixing typo in java dependency

* jdk: changing provides java to a range

* icedtea: cleaning up. Splitting up checksums.

* icedtea: jdk dependency is build only

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

@@ -60,6 +60,9 @@ class Jdk(Package):
     # away you go.
     version('7u80-b0', '6152f8a7561acf795ca4701daa10a965')
 
+    provides('java@8', when='@8u0:8u999')
+    provides('java@7', when='@7u0:7u999')
+
     def url_for_version(self, version):
         url = "http://download.oracle.com/otn-pub/java/jdk/{0}/jdk-{1}-linux-x64.tar.gz"
         version = str(version)