- Makes the default behavior of on-device building with the address sanitizer match the default behavior of building with the address sanitizer on Clang for Desktop Linux distros, which is to use the static library
- Fixes https://github.com/termux/termux-packages/issues/26485
- On devices that do not have `libclang_rt.asan-$arch-android.so` or which have a corrupted one, fixes building on-device with `-fsanitize=address`
- Samsung Galaxy S III SPH-L710 with LineageOS 14.1 Android 7.1.2 before:
```
~ $ clang test.c -fsanitize=address
~ $ ./a.out
WARNING: linker: /data/data/com.termux/files/home/a.out: unsupported flags DT_FLAGS_1=0x8000001
CANNOT LINK EXECUTABLE "./a.out": library "libclang_rt.asan-arm-android.so" not found
Aborted ./a.out
~ $ clang test.c -fsanitize=address -Wl,-rpath=$PREFIX/lib/clang/20/lib/linux
~ $ ./a.out
WARNING: linker: /data/data/com.termux/files/home/a.out: unsupported flags DT_FLAGS_1=0x8000001
~ $ termux-elf-cleaner ./a.out
termux-elf-cleaner: Replacing unsupported DF_1_* flags 134217729 with 1 in './a.out'
~ $ ./a.out
~ $ file /system/lib/libclang_rt.asan-arm-android.so
/system/lib/libclang_rt.asan-arm-android.so: cannot open `/system/lib/libclang_rt.asan-arm-android.so' (No such file or directory)
~ $
```
- After:
```
~ $ clang test.c -fsanitize=address
~ $ ./a.out
WARNING: linker: /data/data/com.termux/files/home/a.out: unsupported flags DT_FLAGS_1=0x8000001
~ $ termux-elf-cleaner a.out
termux-elf-cleaner: Replacing unsupported DF_1_* flags 134217729 with 1 in 'a.out'
~ $ ./a.out
~ $
```
- Vivo iQOO Neo8 V2301A with Android 15 before:
```
thread #1, name = 'a.out', stop reason = signal SIGILL: illegal opcode
```
- After: believed to work
LLVM looks at /proc/self/exe to determine which binary has been called.
This does not work with the proposed changes for termux-exec:
https://github.com/termux/termux-exec/pull/24
Luckily the fallback to look at argv0 works instead.
