SCons updates

* Added the options to build (configurable via config.opts):
  - blender dynamic (default enabled),
  - blender static (default disabled). Not working because of a linking order
    problem. The /usr/lib/libGL.a and /usr/lib/libGLU.a flags need to be
    appended at the end of the link command, not directly after the linker.
    Mailed the SCons mail list for a possible solution.
  - blender player (default disabled). Not implemented yet anyway.
  - blender plugin (default disabled). Not implemented yet anyway.
* Added the following variables to the config.opts:
  - OPENGL_STATIC. This flag is only needed when building blender static.
  - USE_BUILDINFO (true/false). Display build information in the splash
    screen. When enabled, it will always rebuild source/creator/buildinfo.c,
    so for compilation speed reasons, it is not adviced to enable this all the
    time.

I had to make some adjustments specifically for the windows build
(winblender.res) file. This file is only compiled when building the dynamic
blender. I hope this is correct.

source/creator/SConscript

@@ -0,0 +1,29 @@
+creator_env = Environment ()
+
+Import ('cflags')
+Import ('cxxflags')
+Import ('defines')
+Import ('user_options_dict')
+creator_env.Append (CCFLAGS = cflags)
+creator_env.Append (CXXFLAGS = cxxflags)
+creator_env.Append (CPPDEFINES = defines)
+
+source_files = ['creator.c']
+
+creator_env.Append (CPPPATH = ['#/intern/guardedalloc',
+                               '../blender/blenlib',
+                               '../blender/blenkernel',
+                               '../blender/include',
+                               '../blender/blenloader',
+                               '../blender/imbuf',
+                               '../blender/renderconverter',
+                               '../blender/render/extern/include',
+                               '../blender/python',
+                               '../blender/makesdna',
+                               '../kernel/gen_messaging',
+                               '../kernel/gen_system'])
+
+if user_options_dict['USE_QUICKTIME'] == 1:
+    creator_env.Append (CPPDEFINES = ['WITH_QUICKTIME'])
+
+creator_env.Library (target='#'+user_options_dict['BUILD_DIR']+'/lib/blender_creator', source=source_files)