vertex_buffer_new( "vertex:3f,tex_coord:2f,color:4f" ); throws heap exceptions in C++ project on calling free about freetype-gl HOT 3 OPEN

Btw,I debugged the block in vertex-buffer. c (lines 78- 90) and found that the 
free(desc) crashes only on the last attribute "color:4f" which in turn the only 
one which sets desc with strup(start),the previous two set desc with 
strnup.Maybe usage of strup somehow causes location being freed by free() to 
get invalid?

Ok,I fixed it.it becomes obvious if setting the lib to compile to C++ and not 
to C.In such a case the compiler throws error:

" The POSIX name for this item is deprecated. Instead, use the ISO C++ 
conformant name: _strdup  

"

So I replaced all strdup with  _strdup and free() doesn't throw errors 
anymore.Do you want to make this fix in the repo?

This occurs also in VC2013, and _strdup fixes.