Update GCC to 7.4.0

library/gcc

@@ -18,12 +18,12 @@ GitCommit: e17fd3097b743216f292e50ea8e84b3b3bcc4e53
 Directory: 6
 # Docker EOL: 2020-04-30
 
-# Last Modified: 2018-01-25
-Tags: 7.3.0, 7.3, 7
+# Last Modified: 2018-12-06
+Tags: 7.4.0, 7.4, 7
 Architectures: amd64, arm32v5, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: e17fd3097b743216f292e50ea8e84b3b3bcc4e53
+GitCommit: e2740e64805f58dae4eb3a7958ded1fa19e6c349
 Directory: 7
-# Docker EOL: 2019-07-25
+# Docker EOL: 2020-06-06
 
 # Last Modified: 2018-07-26
 Tags: 8.2.0, 8.2, 8, latest