[fpc-pascal] Ansistrings under Android

[de_jean_7777]

Now that I have a working fpc crosscompiler for Android, and all the 
code runs ok, I encountered another problem. Namely working with 
ansistrings causes crashes. For example, in a simple test, calling the 
str() routine will cause a crash due to a run-time 216 error (general 
protection fault). I've also noticed that crashes can occur upon routine 
exit, when ansistrings are freed automatically. I thought that using the 
C memory manager (cmem) might help, but there is no difference.

For some reason, units are not initialized under a android shared 
library, so I call internal_initializeunits() myself in the JNI_OnLoad 
which is called automatically by the JNI, and is called before any other 
routine.