Luckly our `ld' knows the name of our dynamic linker and DTRT.
* Remove the DECpaq shared libs from the standard search dir as linking
with them gives unresolved symbols. Thus we'll use the .a's for now.
* Add the symbols __errno_location, __ieee_get_fp_control, and
__ieee_set_fp_control (mapped to native interfaces) to the static
Compaq Portable Math Library. Thus all symbols are resolved.
This allows `CC=ccc' to build fully native FreeBSD Alpha binaries.