cross-profiles/armv7hf: use the arm-linux-gnueabihf cross compiler.

There's no reason to use the gnueabihf7 variant, because the only difference
are the CFLAGS to build it. Use the gnueabihf one (used by Rpi too).
gcc: update triplets for ARM with glibc and musl.
cross-arm-linux-gnueabihf7: removed; it's not necessary anymore.