build-android: modernize for NDK 26 / libc++;#2021
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The Android build targeted the 2016 gnustl + NDK r17 toolchain, removed in NDK r18+. Port it to libc++ / NDK 26 and adjust for modern devices so the .aar links, loads, and runs.
Build system (build-android/):
Application.mk (new): APP_STL := c++_static,APP_PLATFORM := android-23, -Wl,-z,max-page-size=16384 (16 KB-page alignment for Android 15+ / Play 2025).
Android.mk: drop gnustl includes/LDLIBS; add -DUSE_FILE32API; add a prebuilt iconv module; link order etpan sasl2 ssl crypto iconv icu4c xml2 tidy ctemplate.
build.sh: use APP_ABI/APP_PLATFORM (drop the GCC 4.9 pin); ABIs armeabi-v7a/arm64-v8a/x86 (drop removed armeabi +unsupported x86_64); stop copying libc++_shared (static libc++); pass
-DCMAKE_POLICY_VERSION_MINIMUM=3.5 for CMake 4; extract pre-existing dep zips; rm stale .aar before re-zipping.
Replace example with Kotlin app.