[cmake-developers] [Patch] Added property to disable the "Built target" progress messages in Makefile targets

[Michael Enßlin]

===== Motivation:

In my project, openage, the build system currently produces fairly much
useless output, even if not a single file of the project has changed:

mic at mic ~/git/openage $ make
[  0%] Built target compilepy
[  1%] Built target cythonize
[  1%] Built target codegen
[ 83%] Built target libopenage
[ 84%] Built target openage_testing_cpp_testing
[ 86%] Built target run
[ 87%] Built target openage_cabextract_cabchecksum
[ 88%] Built target openage_cabextract_lzxd
[ 89%] Built target openage_cppinterface_exctranslate
[ 90%] Built target openage_cppinterface_exctranslate_tests
[ 91%] Built target openage_cppinterface_setup_checker
[ 93%] Built target openage_cppinterface_pyobject
[ 94%] Built target openage_game_main_cpp
[ 95%] Built target openage_log_log_cpp
[ 96%] Built target openage_util_fslike_cpp
[ 98%] Built target openage_testing_misc_cpp
[ 99%] Built target inplacemodules
[ 99%] Built target pxdgen
[100%] Built target distfiles
mic at mic ~/git/openage $

That list of targets is expected to grow fairly large in the
near-distant future; at some point, it might even get large enough to
hide actual important compilation messages.

===== Patch:

The patch adds a global property, "TARGET_MESSAGES", which behaves
analogous to "RULE_MESSAGES" in that it can be explicitly set to OFF to
suppress some build output.

When set to OFF, the above invocation of `make` will produce no output.
Otherwise, CMake will behave as usual.

The patch includes some documentation.

~ Michael Ensslin
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