We have two ways to disable third-party/

  1. make USE_BUNDLED_DEPS=OFF
  2. cmake USE_BUNDLED=OFF

The example used the make option in a cmake context.

The main purpose of this build-type was to avoid unwanted ~/.nvimlog
files (which could get really big, and also affects performance) for
non-devs. But that is no longer necessary since the log system now
avoids non-critical logging by default (#6827).

This essentially reverts 87e5a4131666e44354f280538cbc6bbe52225092

- Establish ERROR log level as "critical". Such errors are rare and will
  be valuable when users encounter unusual circumstances.
- Set -DMIN_LOG_LEVEL=3 for release-type builds

This reverts commit c13f72ee0a6600963a10e57155d2e814d56599e2.

References #5447.

We use a Makefile which in turn uses cmake. If we wanted to set the install
prefix for cmake, we had to do this so far:

  make CMAKE_FLAGS="-DCMAKE_INSTALL_PREFIX=/tmp/nvim"

That's long and hard to remember. Following the conventions of other Makefiles,
this now works as well and is equivalent:

  make PREFIX=/tmp/nvim

- Check if MIN_LOG_LEVEL value is a number 0-3, default to
  INFO (1) or ignore it in Release mode
- When TRAVIS_CI_BUILD is ON the default is DEBUG (0)
- Add local.mk.example

Introduce new build type Dev that replaces RelWithDebInfo for development
builds off master and has optimizations, debug info, and logging enabled.
Keep assertions enabled for RelWithDebInfo.

This doesn't prevent compilation of jemalloc, but the important thing is
that it prevents it being used in nvim.

refs 6cd20177df9d675c4c8de9ae27ce8c0ea2a94cca
refs 95707bf336794c7ec8991917f184c02ae873dd8c

DUSE_JEMALLOC was removed in 8130eb1191aece52d8b2790302abf1bd09aaf90f

Helped-by: Florian Walch <florian@fwalch.com>
Helped-by: John Szakmeister <john@szakmeister.net>