add missing cmake flag to set up JNI for LLama Android Demo

[salykova]

Compilation of JNI library results in the following error, due to missing cmake flag -DANDROID_PLATFORM=android-23

[ 92%] Built target statusor
[ 92%] Building CXX object re2/CMakeFiles/re2.dir/re2/prog.cc.o
[ 93%] Building CXX object re2/CMakeFiles/re2.dir/re2/re2.cc.o
[ 94%] Linking CXX shared library libexecutorch_jni.so
[ 94%] Building CXX object re2/CMakeFiles/re2.dir/re2/regexp.cc.o
[ 94%] Linking CXX static library libabsl_log_flags.a
[ 94%] Built target log_flags
ld: error: undefined symbol: stderr
>>> referenced by Posix.cpp:101 (/home/salykova/Projects/executorch/runtime/platform/target/Posix.cpp:101)
>>>               Posix.cpp.o:(et_pal_current_ticks) in archive /home/salykova/Projects/executorch/cmake-out-android/lib/libexecutorch_no_prim_ops.a
>>> referenced by Posix.cpp:101 (/home/salykova/Projects/executorch/runtime/platform/target/Posix.cpp:101)
>>>               Posix.cpp.o:(et_pal_current_ticks) in archive /home/salykova/Projects/executorch/cmake-out-android/lib/libexecutorch_no_prim_ops.a
[ 95%] Building CXX object re2/CMakeFiles/re2.dir/re2/set.cc.o
[ 95%] Building CXX object re2/CMakeFiles/re2.dir/re2/simplify.cc.o
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
gmake[2]: *** [CMakeFiles/executorch_jni.dir/build.make:151: libexecutorch_jni.so] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:738: CMakeFiles/executorch_jni.dir/all] Error 2
gmake[1]: *** Waiting for unfinished jobs....
[ 95%] Building CXX object re2/CMakeFiles/re2.dir/re2/tostring.cc.o
[ 96%] Building CXX object re2/CMakeFiles/re2.dir/re2/unicode_casefold.cc.o
[ 96%] Building CXX object re2/CMakeFiles/re2.dir/re2/unicode_groups.cc.o
[ 96%] Building CXX object re2/CMakeFiles/re2.dir/util/rune.cc.o
[ 97%] Building CXX object re2/CMakeFiles/re2.dir/util/strutil.cc.o
[ 97%] Linking CXX static library libabsl_flags_usage_internal.a
[ 97%] Built target flags_usage_internal
[ 97%] Linking CXX static library libre2.a
[ 97%] Built target re2
gmake: *** [Makefile:136: all] Error 2

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3619

• :page_facing_up: Preview Python docs built from this PR

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:x: 2 New Failures

As of commit 97200e426c4696beccfe724f35fbab9c62bfcbdb with merge base 99ec946944719f4ed20d0f5cafe4f1f8a7ebbcc3 ():

NEW FAILURES - The following jobs have failed:

• Android / test-llama-app / mobile-job (android) (gh) Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers
• Apple / upload-frameworks-ios (gh) Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers

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[facebook-github-bot]

@kirklandsign has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@kirklandsign merged this pull request in pytorch/executorch@121b04c4e7dd5d8a1e92242dbd6df39e970c1a68.

[kirklandsign]

Thank you @salykova