[ARM] Remove FP work-arounds.

[ARM] Remove FP work-arounds.

We used to have code to allow binaries linked against glibc to run,
when glibc itself contained some FP instructions (for PCS stack
frames for functions like printf and scanf) thereby allowing FP
emulators like nwfpe to be built as modules.

This has proved to be unreliable with later compilers, so support
for this was dropped a while ago.  Since no one complained, we can
finally remove the dead code.

(NB. a klibc based module-init-tools shouldn't suffer from this
problem.)