[m-rev.] for review: fix octal encoding bug in extras/graphics/mercury_allegro/samples

[Fabrice Nicol]

A final modest proposal for review by anyone.

-------------------------------------------------------------

Bug issue (fixed):

samples/demo/title.m:

samples/mandel/mandel.m:

         Compilation crashes due to illegal (perhaps obsolete) octal 
encoding

         of 'Escape' Ascii character.

---------------------------------------------------------

Proposed fix:

         - Change illegal '\033' into legal 0o033

         - Module char should be imported as int value has to be cast to 
char type.

Incidentally, added tested version 4.4.x  of allegro library to README.

---------------------------------------------------------

Fix was tested under Gentoo Linux (amd64 branch, freeglut v.3.2.1, mesa 
v.21.2.6) by building all allegro samples.

Fabrice
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