The previous approach appended TERMUX_PREFIX to the empty default sysroot, which would
render those paths useless if the --sysroot command-line flag was ever set. With this
approach, clang reuses much more of the existing sysroot logic and makes it more
likely that a passed-in sysroot will work.
Also, remove the rpath for alternate architectures, as it wasn't working.
Butta
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