Build: add config for developers

This has faster builds, error checks and tests. The number of cmake options
for this type of thing has grown over the years and it's convenient to be
able to point new developers to a single target.

Previously the combination of all these options did not work correctly, now
all tests should pass.

The easiest way to use this is with the make wrapper, for example:
make full developer debug

Or set it manually with CMake:
cmake -C ../blender/build_files/cmake/config/blender_developer.cmake .

Differential Revision: https://developer.blender.org/D5149

GNUmakefile

@@ -37,6 +37,7 @@ Convenience Targets
    * bpy:           Build as a python module which can be loaded from python directly.
    * deps:          Build library dependencies (intended only for platform maintainers).
 
+   * developer:     Enable faster builds, error checking and tests, recommended for developers.
    * config:        Run cmake configuration tool to set build options.
 
    Note: passing the argument 'BUILD_DIR=path' when calling make will override the default build dir.
@@ -221,6 +222,10 @@ ifneq "$(findstring bpy, $(MAKECMDGOALS))" ""
 	BUILD_CMAKE_ARGS:=$(BUILD_CMAKE_ARGS) -C"$(BLENDER_DIR)/build_files/cmake/config/bpy_module.cmake"
 endif
 
+ifneq "$(findstring developer, $(MAKECMDGOALS))" ""
+	BUILD_CMAKE_ARGS:=$(BUILD_CMAKE_ARGS) -C"$(BLENDER_DIR)/build_files/cmake/config/blender_developer.cmake"
+endif
+
 
 # -----------------------------------------------------------------------------
 # Blender binary path
@@ -294,6 +299,7 @@ lite: all
 cycles: all
 headless: all
 bpy: all
+developer: all
 
 # -----------------------------------------------------------------------------
 # Build dependencies