Fix android build on Fedora 40. (#32532)

* Postfix PATH with android toolchain:
  We only need to edit path for the linker specified
  in the `.cargo/config.toml` to be found. Adding the
  NDK clang to the end of PATH is sufficient for that.
  Adding the NDK clang to the front can cause problems
  however, since it causes the NDK `clang` to be
  preferred over the system clang. This can cause
  problems on some systems, where compiling
  e.g. buildscripts for HOST subsequently fails.
* Prefix target compiler and compiler flags variables
  with `TARGET_` so as not to influence compilation
  for HOST targets.
 * SET `CLANG_PATH` to avoid [bindgen #2682]

 [bindgen #2682]: https://github.com/rust-lang/rust-bindgen/issues/2682

Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>

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