[ooc-compiler] H20 patch

[Frank C. <fj...@th...>]

I'd submit this through sourceforge but I can't work out how. Bugzilla has 
always confused me...

The attached patch addresses two issues:

* Adds "/usr/include" and "/usr/local/include" to the default search paths
* Treats single-character strings as strings instead of characters unless 
they are delimited by the "'" character. This is still not even close to 
standard C definitions of string and character constants.

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