Update docker-library images

- `golang`: add `pkg-config` for cgo (docker-library/golang#114)
- `julia`: remove `git` (docker-library/julia#9)
- `ruby`: rubygems 2.6.7

library/golang

@@ -6,7 +6,7 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
 GitRepo: https://github.com/docker-library/golang.git
 
 Tags: 1.6.3, 1.6
-GitCommit: 9f666dc2f4f51df564613f787d28b3a2353243e0
+GitCommit: 85df9970e9548f38248d36f6f4341e2aea128515
 Directory: 1.6
 
 Tags: 1.6.3-onbuild, 1.6-onbuild
@@ -14,7 +14,7 @@ GitCommit: ce284e14cdee73fbaa8fb680011a812f272eae2e
 Directory: 1.6/onbuild
 
 Tags: 1.6.3-wheezy, 1.6-wheezy
-GitCommit: 9f666dc2f4f51df564613f787d28b3a2353243e0
+GitCommit: 85df9970e9548f38248d36f6f4341e2aea128515
 Directory: 1.6/wheezy
 
 Tags: 1.6.3-alpine, 1.6-alpine
@@ -27,7 +27,7 @@ Directory: 1.6/windows/windowsservercore
 Constraints: windowsservercore
 
 Tags: 1.7.1, 1.7, 1, latest
-GitCommit: 3a3e91c242b58a7d4e6022b3710b2e871f0ee5d6
+GitCommit: 85df9970e9548f38248d36f6f4341e2aea128515
 Directory: 1.7
 
 Tags: 1.7.1-onbuild, 1.7-onbuild, 1-onbuild, onbuild
@@ -35,7 +35,7 @@ GitCommit: 2372c8cafe9cc958bade33ad0b8b54de8869c21f
 Directory: 1.7/onbuild
 
 Tags: 1.7.1-wheezy, 1.7-wheezy, 1-wheezy, wheezy
-GitCommit: 3a3e91c242b58a7d4e6022b3710b2e871f0ee5d6
+GitCommit: 85df9970e9548f38248d36f6f4341e2aea128515
 Directory: 1.7/wheezy
 
 Tags: 1.7.1-alpine, 1.7-alpine, 1-alpine, alpine

library/julia

@@ -5,4 +5,4 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
 GitRepo: https://github.com/docker-library/julia.git
 
 Tags: 0.5.0, 0.5, 0, latest
-GitCommit: 1eb5fbfa0d88c831bf70963e39a1ec14f8f64c34
+GitCommit: 0f29b23863e4ff1c99b13a30e845b66c7468f79b

library/ruby

@@ -5,15 +5,15 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
 GitRepo: https://github.com/docker-library/ruby.git
 
 Tags: 2.1.10, 2.1
-GitCommit: 281978ef87397763e377774740d82c8d87674ae9
+GitCommit: 1bfd61b7b247fef496cf392fa2fc3d1d6d32467e
 Directory: 2.1
 
 Tags: 2.1.10-slim, 2.1-slim
-GitCommit: 281978ef87397763e377774740d82c8d87674ae9
+GitCommit: 1bfd61b7b247fef496cf392fa2fc3d1d6d32467e
 Directory: 2.1/slim
 
 Tags: 2.1.10-alpine, 2.1-alpine
-GitCommit: 281978ef87397763e377774740d82c8d87674ae9
+GitCommit: 1bfd61b7b247fef496cf392fa2fc3d1d6d32467e
 Directory: 2.1/alpine
 
 Tags: 2.1.10-onbuild, 2.1-onbuild
@@ -21,15 +21,15 @@ GitCommit: 5d04363db6f7ae316ef7056063f020557db828e1
 Directory: 2.1/onbuild
 
 Tags: 2.2.5, 2.2
-GitCommit: 281978ef87397763e377774740d82c8d87674ae9
+GitCommit: b5b04869f0b8e3de60d16dd2ec9e76e4d6913a76
 Directory: 2.2
 
 Tags: 2.2.5-slim, 2.2-slim
-GitCommit: 281978ef87397763e377774740d82c8d87674ae9
+GitCommit: b5b04869f0b8e3de60d16dd2ec9e76e4d6913a76
 Directory: 2.2/slim
 
 Tags: 2.2.5-alpine, 2.2-alpine
-GitCommit: 281978ef87397763e377774740d82c8d87674ae9
+GitCommit: b5b04869f0b8e3de60d16dd2ec9e76e4d6913a76
 Directory: 2.2/alpine
 
 Tags: 2.2.5-onbuild, 2.2-onbuild
@@ -37,15 +37,15 @@ GitCommit: 5d04363db6f7ae316ef7056063f020557db828e1
 Directory: 2.2/onbuild
 
 Tags: 2.3.1, 2.3, 2, latest
-GitCommit: 281978ef87397763e377774740d82c8d87674ae9
+GitCommit: 2203763aaed0c68a4e909a22956c97244f6ac887
 Directory: 2.3
 
 Tags: 2.3.1-slim, 2.3-slim, 2-slim, slim
-GitCommit: 281978ef87397763e377774740d82c8d87674ae9
+GitCommit: 2203763aaed0c68a4e909a22956c97244f6ac887
 Directory: 2.3/slim
 
 Tags: 2.3.1-alpine, 2.3-alpine, 2-alpine, alpine
-GitCommit: 281978ef87397763e377774740d82c8d87674ae9
+GitCommit: 2203763aaed0c68a4e909a22956c97244f6ac887
 Directory: 2.3/alpine
 
 Tags: 2.3.1-onbuild, 2.3-onbuild, 2-onbuild, onbuild