This crashes on Linux as pKeyValuesData is NULL when deleteThis() is
invoked. This likely is caused by another issue, but fixing this here
seems good regardless.

This is important for case-sensitive filesystems/operating systems (i.e.
Linux).

It used new char[] before, but it seems when the buffer is allocated
using filesystem->ReadFileEx() we should free() the buffer, not delete[]
it. CUtlBuffer also free()s the buffer, so malloc() should be the saner
choice here.

This is important for case-sensitive filesystems/operating systems (i.e.
Linux).

Caused cut off shadows on Linux.
Taken from Entropy : Zero.