m4 files as well


git-svn-id: https://svn.code.sf.net/p/gphoto/code/branches/libgphoto2-2_3/m4@9455 67ed7778-7388-44ab-90cf-0a291f65f57c
Fix --with-libfoo=PREFIX handling

git-svn-id: https://svn.code.sf.net/p/gphoto/code/branches/libgphoto2-2_3/m4@9472 67ed7778-7388-44ab-90cf-0a291f65f57c
Fix --with-libfoo=PREFIX handling (either use libfoo.la or warn)

git-svn-id: https://svn.code.sf.net/p/gphoto/code/branches/libgphoto2-2_3/m4@9474 67ed7778-7388-44ab-90cf-0a291f65f57c
Merge new m4 macros from trunk (we're going to need the udev macro)


git-svn-id: https://svn.code.sf.net/p/gphoto/code/branches/libgphoto2-2_3/m4@9666 67ed7778-7388-44ab-90cf-0a291f65f57c