Create a branch of the m4 macros for the libgphoto2-2_2 release branch.


git-svn-id: https://svn.code.sf.net/p/gphoto/branches/libgphoto2-2_2/m4@8963 67ed7778-7388-44ab-90cf-0a291f65f57c
only require popt if it really is mandatory

git-svn-id: https://svn.code.sf.net/p/gphoto/branches/libgphoto2-2_2/m4@8978 67ed7778-7388-44ab-90cf-0a291f65f57c