Patch to newlib-1.8.1 concerning non-reentrant functions

[Johannes Reisinger]

Hallo!

I have made some changes to newlib-1.8.1 in order to make some
non-reentrant functions reentrant (asctime, localtime, strtok, rand,
srand, w_gamma, w_lgamma, wf_gamma and wf_lgamma). Because these
changes do affect the layout of the 'struct reent', I have guarded
them by a preprocessor macro '_COMPATIBLE_STRUCT_REENT' (I believe this
should be a configure-parameter, but I do not know how to introduce
one).

Another set of changes defines some initialised variables/structures
as const in order to save space in multithreaded systems with
shared text segments.

I append the patch. Please let me know if you are willing to apply it
to your sources and if some additional action is required by me.

-jr
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Dr. Johannes Reisinger
System Design
FREQUENTIS
A-1120 Wien, Spittelbreitengasse 34
http://www.frequentis.com
Tel: +43/1/8100606-329, Fax -399
mailto:jreising@frequentis.com
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