pgsql: Add /config.cache to .gitignore in back branches

Add /config.cache to .gitignore in back branches

For some reason config.cache was not being git-ignored in these back
branches.

Backpatch-through: 9.2 to 9.4

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/1f0d78863eb88ca8ee9c3b5215d532900e722e57

Modified Files
--------------
.gitignore | 1 +
1 file changed, 1 insertion(+)

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