[PATCH] Re-enable malloc_lock for newlib-nano

[Andre Vieira (lists)]

Hello,

This patch re-enables the use of __malloc_lock and __malloc_unlock for
newlib-nano, re-tieing it to the newlib-multithread option. This change
makes sure a newlib-nano implementation can implement these two
functions by overwriting and otherwise they will be empty stubs.

Tested for on arm-none-eabi with both newlib and newlib-nano configurations.

Is this OK?

Cheers,
Andre

LOG:
Re-enable the use of __malloc_lock and __malloc_unlock newlib-nano, tied
the newlib-multithread.
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