gitdpkgname is a very small script that is used by gitfm(1) when using
any of the ^C^D commands that expect a debian packagename.
For each argument that ends in .deb, gitdpkgname queries the named
package for its name and prints it. All other arguments are printed
This enables commands (e.g. ^C^DL) expecting a packagename to be given
a .deb file, and the packagename will be extracted automatically.