Require automake 1.11 and libtool 2.2

Automake 1.11 was already required due to XZ support.
eog dropped support for libtool 1.x already.
Update git.mk

Revision 7914e9c3 from https://github.com/behdad/git.mk
Fix automake deprecation warnings

INCLUDE is deprecated since 2001.
Use the equivalent AM_CPPFLAGS variable.
Use separate m4 macro dir

As done by eog already