[Tremor] Patches for Embedded Devices

[Colin Ward]

   Hello all.

   I have recently ported Tremor to Symbian OS and there were a few 
changes that I made to the source which would benefit anyone doing a new 
port to an embedded device.

   These changes mainly pertain to making global static data const. 
Unfortunately the const keyword is somewhat insidious and so making 
certain static globals const requires changing many references to them 
to also be const, throughout the source, so the patch looks rather large.

   I also made some changes in os.h to take into account that certain 
things that are available when compiling when compiling under Windows 
are not available when compiling under Windows but with the Symbian OS 
emulator as a target.  For example, malloc.h.  The

   #if defined(_WIN32) && !defined(__SYMBIAN32__)

   and

   #if defined(__SYMBIAN32__) && defined(__WINS__)

   Change that I made to account for this is in line with similar 
changes that I had to make to other xiph.org modules, and is in 
accordance with conversations I had with people on various xiph.org IRC 
channels a while ago.  They should not have any impact on any targets 
bug Symbian.

   This is my first patch for Tremor so let me know if there is anything 
in here that is not in line with the xiph.org way.

--
Colin Ward
Senior Sofware Engineer, Symbian OS
CSIRO, Australia