[Vortex] PATCH: Search-path initialization for OS X framework

[Jens Alfke]

There's a patch to vortex.c that I needed to make, to support  
packaging Vortex as an OS X framework. The framework's directory needs  
to be added to Vortex's search path, because that's where the DTD  
files are. But there's a chicken-and-egg problem, because client code  
can't change the search path until Vortex is initialized, but that  
initialization fails if it can't find the DTD files.

So I modified the initialization code to use the CFBundle API to  
locate the framework's directory and add it to the search path. The  
changes are conditionalized with #ifdef AXL_OS_DARWIN, similarly to  
the conditional compilation for Windows support.

Here's the patch. Without this, the framework built by the Xcode  
project I submitted earlier today will build, but won't run.

—Jens

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