ogma-language-c: Replace homepage. Refs nasa#147.

The cabal files indicate http://nasa.gov as the homepage for all
packages. However, we don't really have an Ogma homepage on NASA gov, so
it makes no sense to point to that website.

This commit replaces the cabal file's homepage to point to Ogma's repo's
URL.

ogma-language-c/ogma-language-c.cabal

@@ -33,7 +33,7 @@ build-type:          Custom
 
 name:                ogma-language-c
 version:             1.4.0
-homepage:            http://nasa.gov
+homepage:            https://github.com/nasa/ogma
 license:             OtherLicense
 license-file:        LICENSE.pdf
 author:              Ivan Perez, Alwyn Goodloe