[issue23968] rename the platform directory from plat-$(MACHDEP) to plat-$(PLATFORM_TRIPLET)

[Chi Hsuan Yen]

Chi Hsuan Yen added the comment:

Changeset 5c77488830bc brings a regression - Android build fails with the following message:

export H2PY; H2PY="$PYTHON_FOR_BUILD /home/yen/python3-android/src/cpython/build-target/../Tools/scripts/h2py.py"; \
cd ../Lib/plat-aarch64-linux-gnu;  ./regen
+ _PYTHON_PROJECT_BASE=/home/yen/python3-android/src/cpython/build-target _PYTHON_HOST_PLATFORM=linux-aarch64 PYTHONPATH=/home/yen/python3-android/src/cpython/build-target/build/lib.linux-aarch64-3.6:../Lib:../Lib/plat-aarch64-linux-gnu python3.6 /home/yen/python3-android/src/cpython/build-target/../Tools/scripts/h2py.py -i '(u_long)' /opt/android-ndk/platforms/android-21/arch-arm64/usr/include/sys/types.h /opt/android-ndk/platforms/android-21/arch-arm64/usr/include/netinet/in.h /opt/android-ndk/platforms/android-21/arch-arm64/usr/include/dlfcn.h
./regen: line 33: _PYTHON_PROJECT_BASE=/home/yen/python3-android/src/cpython/build-target: No such file or directory
make[1]: *** [Makefile:1324: ../Lib/plat-aarch64-linux-gnu] Error 127
make[1]: Leaving directory '/home/yen/python3-android/src/cpython/build-target'
make: *** [Makefile:36: python] Error 2

The previous changeset 1902e1d79e25 builds fine. Prepending `PYTHON_FOR_BUILD` in configure.ac with `env` makes the whole build work again.

>From the message seems plat-* directories are re-generated with a different name. Is it expected?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23968>
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