ARM long branch stub: pic

[Christophe LYON]

Hello,

There is a bug when computing the target of a long branch stub in PIC 
mode (it jumps 4 bytes too far). I propose the attached patch.

Note that the current PIC stub is not correct (it uses a target address 
rather than an offset), I will send a separate patch for this later.

A Thumb mapping symbol was also missing in the short v4t thumb->arm 
stub, but this had no impact on the testsuite.

Validated on arm-none-eabi and arm-linux-gnueabi.

Christophe.
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