Add GCC 7.1.0

library/gcc

@@ -1,4 +1,4 @@
-# this file is generated via https://github.com/docker-library/gcc/blob/8c7687860cdd4ef9227c249ca4587984e2636a55/generate-stackbrew-library.sh
+# this file is generated via https://github.com/docker-library/gcc/blob/87dfadb46c2a905abb1bcd383ec15028e4454435/generate-stackbrew-library.sh
 
 Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
@@ -17,7 +17,13 @@ Directory: 5
 # Docker EOL: 2017-06-03
 
 # Last Modified: 2016-12-21
-Tags: 6.3.0, 6.3, 6, latest
+Tags: 6.3.0, 6.3, 6
 GitCommit: 758ef9b4b4978a3a06ea84422a76ed906c94c606
 Directory: 6
 # Docker EOL: 2017-12-21
+
+# Last Modified: 2017-05-02
+Tags: 7.1.0, 7.1, 7, latest
+GitCommit: 33c5d715a785d6e3c61ff84e70eff592216fe29f
+Directory: 7
+# Docker EOL: 2018-05-02