Bug#727175: libsoil crashes when calling most functions

[Brandon]

Package: libsoil1
Version: 1.07~20080707.dfsg-2
Severity: important
Tags: patch

libsoil crashes when executing most functions. The problem is that some
internal functions use glGetString improperly, glGetString then returns
a null pointer, and then those functions send that null pointer to
strstr, which causes a crash.

I have attached a patch which replaces glGetString with glGetIntegerv
and glGetStringi, which appears to be what was intended.

I also defined GL_GLEXT_PROTOTYPES before the call to include GL.h. It
alleviates many warnings, but I'm not sure if it affects the output or
if you'd rather do it a different way.

-Brandon
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