Added gitignore rules to files which are generated after running the mkbuild script.

- This helps make sure that the build files don't get tracked in the git tracker.
Status Job ID Name Coverage
  Build Hamara Sugam Amd64
canceled #1184
allowed to fail
build-hamara-sugam-amd64

00:03

 
  Build Hamara Sugam I386
canceled #1185
build-hamara-sugam-i386