Milton Woods 41e3e7dbff ghostscript: add version 9.21 and handle new URL format (#3898) ... * ghostscript: add version 9.21 and handle new URL format * ghostscript: add url of latest version to fix `spack versions` * ghostscript: use github for all versions our package provides (>= 9.18)		2017-04-27 10:42:56 -05:00
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spack	ghostscript: add version 9.21 and handle new URL format (#3898)	2017-04-27 10:42:56 -05:00