fix: target API 26 in ELF — pthread_atfork blocked by bionic at API 21
The .note.android.ident ELF section had API level 0x15 (21), causing Android's bionic linker to block pthread_atfork (used by rand crate). Fix: pass -P 26 to cargo-ndk and set linker to android26-clang. Verified: ELF now shows 0x1a (26). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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