[GRASS-git] [OSGeo/grass] 1e0c11: libgis: Enable the C99 bool type (#1567)

[nilason]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass
  Commit: 1e0c11f526f64755f877957ce6c14b2159c3823f
      https://github.com/OSGeo/grass/commit/1e0c11f526f64755f877957ce6c14b2159c3823f
  Author: nilason <n_larsson at yahoo.com>
  Date:   2021-05-19 (Wed, 19 May 2021)

  Changed paths:
    M include/grass/gis.h
    M lib/lidar/lidar.h
    M raster/r.param.scale/param.h
    M raster/r.surf.idw/main.h
    M raster3d/r3.showdspf/Ball.c
    M raster3d/r3.showdspf/togif.c
    M vector/v.hull/chull.c

  Log Message:
  -----------
  libgis: Enable the C99 bool type (#1567)

Enables globally the C99 'bool' type with its values 'true' and 'false'.

The old boolean constants 'TRUE' and 'FALSE' are still valid but
redefined to 'true' and 'false' to emphasize their equivalence.

(Re-)definitions of TRUE/FALSE in modules are removed.

This change was originally triggered by a conflict of v.hull -- defining
a local bool type -- with GDAL 3.3 which introduced the inclusion of
stdbool.h (#1563).