* Minor cleanup of SCons files

- cleanup of boolean usage - use True and False now instead of 'true'/'false' or 0/1
- changed SConscripts accordingly

source/blender/nodes/SConscript

@@ -31,14 +31,14 @@ if env['WITH_BF_VERSE']:
 if env['WITH_BF_VERSE']:
     defs += ' WITH_VERSE'
 
-if env['WITH_BF_OPENEXR'] == 1:
+if env['WITH_BF_OPENEXR']:
     defs += ' WITH_OPENEXR'
 
-if env['WITH_BF_FFMPEG'] == 1:
+if env['WITH_BF_FFMPEG']:
     defs += ' WITH_FFMPEG'
     incs += ' ' + env['BF_FFMPEG_INC']
 
-if env['WITH_BF_QUICKTIME'] == 1:
+if env['WITH_BF_QUICKTIME']:
     defs += ' WITH_QUICKTIME'
     incs += ' ' + env['BF_QUICKTIME_INC']