[PATCH] Improve execl* functions

[Federico Terraneo]

Hi,
I propose the following patch to the execl* functions in newlib that 
does the following:
- it returns an error if more than the maximum number of arguments are 
passed instead of corrupting the stack
- it allows to tweak the maximum number of arguments at the time of 
compiling newlib by defining the ARG_NUM_MAX macro

This patch is originally meant for the Miosix OS to allow reducing the 
maximum number of arguments with the intent of reducing the stack usage 
of the execl* functions in low memory microcontrollers, but I think it 
is of general applicability and can of course be useful also to increase 
this value for desktop-class targets.

Best regards,
Federico Terraneo


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