fix(android): force API-26 NDK linker via docker env vars

The previous commit bumped minSdk from 24 to 26 in build.gradle.kts
hoping tauri-cli would pick it up and use the android26-clang linker,
but the crash recurred at exactly the same frame (__init_tcb via
pthread_create via std::thread::spawn). That means tauri-cli is
ignoring the gradle minSdk value and sticking with its hardcoded
aarch64-linux-android24-clang.

The android24 linker resolves __init_tcb against the broken static
stub in libc.a (API 24 does NOT export __init_tcb as a dynamic symbol
from libc.so — it only exists in the static archive, and the stub
expects the TCB to be initialised by a running static init path,
which never happens in a dlopen-loaded .so).

Override the linker env vars directly in the docker run invocation
for all four ABIs. These take precedence over anything tauri-cli or
.cargo/config.toml might set.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/build-tauri-android.sh

@@ -153,6 +153,10 @@ docker run --rm \
     --user 1000:1000 \
     -e DO_INIT="$DO_INIT" \
     -e PROFILE_FLAG="$PROFILE_FLAG" \
+    -e CARGO_TARGET_AARCH64_LINUX_ANDROID_LINKER=/opt/android-sdk/ndk/26.1.10909125/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android26-clang \
+    -e CARGO_TARGET_ARMV7_LINUX_ANDROIDEABI_LINKER=/opt/android-sdk/ndk/26.1.10909125/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi26-clang \
+    -e CARGO_TARGET_X86_64_LINUX_ANDROID_LINKER=/opt/android-sdk/ndk/26.1.10909125/toolchains/llvm/prebuilt/linux-x86_64/bin/x86_64-linux-android26-clang \
+    -e CARGO_TARGET_I686_LINUX_ANDROID_LINKER=/opt/android-sdk/ndk/26.1.10909125/toolchains/llvm/prebuilt/linux-x86_64/bin/i686-linux-android26-clang \
     -v "$BASE_DIR/data/source:/build/source" \
     -v "$BASE_DIR/data/cache/cargo-registry:/home/builder/.cargo/registry" \
     -v "$BASE_DIR/data/cache/cargo-git:/home/builder/.cargo/git" \