build: use PIE objects for static libraries if b_staticpic=false but b_pie=true

If static_library is used as a convenience library (e.g. for link_whole)
it should in principle not need position independent code.
However, if the executables that the libraries is linked to are PIE,
the non-PIC objects in the static library will cause linker errors.
To avoid this, obey b_pie for static libraries if either b_staticpic=false
or they use "pic: false".

Without this patch, QEMU cannot use b_staticpic, which causes a slowdown
on some QEMU benchmarks up to 20%.

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