Fix Curl/Internal.hs not being in gitignore

This is an autogenerated file, so it has to go into gitignore, thanks
Michael!

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michele Tartara <mtartara@google.com>

.gitignore

@@ -125,5 +125,6 @@
 
 # automatically-built Haskell files
 /src/Ganeti/Constants.hs
+/src/Ganeti/Curl/Internal.hs
 /src/Ganeti/Version.hs
 /test/hs/Test/Ganeti/TestImports.hs