Adding static-PIE support to binutils

[Cary Coutant]

> This is OK to commit with a suitable ChangeLog.  I think a separate ld
> option is best too, because historically -static and its aliases
> -Bstatic, -dn, -non_shared really are about what type of libraries are
> accepted rather than choosing linker output type.

Gold actually separates these concepts: -Bstatic/-dn and -Bdynamic/-dy
are about what kinds of libraries to search for, while -static and
-shared/-Bshareable/-G determine what kind of output to produce.

-cary