bug+patch for locateInStringList (physfs 1.1.0)

[Matze Braun]

Hi,

The locateInStringList function from physfs 1.1.0 contains a bug:
if the string we search is greater than all elements in a list, then
"lo" will become hi+1 and exceeds the limits of the list. This bug is
quiet severe as it makes physfs randomly crash when
PHYSFS_enumerateFiles is used.

I adapted the algorithm from STL std::lower_bound to work in physfs.
This makes the code correct and a bit cleaner. A patch is attached to
this e-mail.

I hope you can soon find the time to release a new version of physfs!

Greetings,
	Matze

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