gcc: drop explicit -fno-PIE, let gcc figure this out.
gcc: drop explicit -fno-PIE, let gcc figure this out.

Explicit -fno-PIE results in parts of libstdc++.a being built non-PIC,
which breaks -static-libstdc++ for PIE binaries.
Also requires lots of fiddling in the build system which we try to
avoid.

See #8842.

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