Fix make check, otherwise it fails on
GEN public-submodule-commit
Stopping at 'spice-common'; script returned non-zero status.
maint.mk: found non-public submodule commit
Acked-by: Frediano Ziglio <fziglio@redhat.com>
The 'make syntax-check' target is used to perform various code
style sanity checks, as well as to detect certain trivial error
patterns. The target is placed in GNUmakefile, instead of Makefile.am
since it relies on GNU specific make extensions.
The actual GNUmakefile and maint.mk files are taken from the
GNULIB project, unchanged
The cfg.mk file is used to configure which of the syntax checks
are activated, to allow addition of new project specific syntax
checks, and to blacklist certain files which should not be checked
* .mailmap: Add mapping for various broken email addrs in
commit log, to stop complaints about AUTHORS file missing
entries
* GNUmakefile: define the 'syntax-check' rule
* maint.mk: definition of standard syntax checks
* cfg.mk: configuration for checks
