PR9743 / ARM: long branch stubs to PLT

[Christophe LYON]

Hello,

I propose the attached patch to fix PR9743. In summary, long branch 
stubs were not inserted if the target was a PLT entry. In addition to 
adding support for these, I:

- took this opportunity to improve some comments and rename the stubs in 
a hopefully more consistent way.

- fixed a stub in thumb only mode (elf32_arm_stub_long_branch_thumb_only).

- I hope I got all the stubs right this time :-)

- I removed some interworking warnings because I don't feel very 
confortable with them. More skilled people are welcome to explain me if 
I got it wrong.

- I added a few new tests for the new stubs, and updated a few old ones.

- validated on arm-none-eabi, arm-linux-gnueabi, arm-elf.

- I also checked that GCC's cc1-dummy now links in the configuration of 
the original bug report - and "cc1-dummy --help" correctly displays the 
help message.

Christophe.
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