Use cmake --build instead of Make

- If possble try to abstract away from Make, and use cmake --build
- third-party still needs to find Make to build some components
- Removed search for Make from CMakeLists.txt
* for CMake < 3.0 --build has no color output
coverity/13765,13766,13767,13768: Fix memory leaks in hardcopy.c

The function mch_print_begin() returns early in case of an
error, but without freeing allocated memory.
To fix this, use stack allocation instead of heap allocation
for the variables res_prolog, res_encoding, res_cidfont and
res_cmap.
Travis: Remove Coverity build.

Coverity is now handled by neovim/bot-ci.
Merge pull request #1483 from oni-link/fix.mch_print_begin.memory.leak.stackversion

coverity/13765,13766,13767,13768: Fix memory leaks in hardcopy.c
Merge pull request #1157 from fwalch/remove-coverity

Travis: Remove Coverity build.
Merge pull request #1485 from equalsraf/tb-no-make-prg

Use cmake --build inside CMake scripts instead of calling Make directly
doc: update msgpack_rpc documentation to use nvim as variable name #1470
doc: Remove MS-DOS specific options bioskey and conskey #1353
Fix #1484: search gettext subdir for header

On some systems, such as NetBSD, the gettext header is tucked under the
gettext directory in the system include area.  Let's add a path suffix
to ensure we correctly discover the header on such systems.
Merge pull request #1487 from jszakmeister/search-gettext-subdir

Fix #1484: search gettext subdir for header
Removing code duplication in vim_strchr()

Logic defined in vim_strbyte() is duplicated at the end of vim_strchr().
Replacing duplicated code with a call to vim_strbyte().
nonnull arg function attribute on vim_strchr()
nonnull arg function attribute on vim_strbyte()