wip: proot fast path tweak

app/src/main/java/com/droiddeck/launcher/runtime/ProotFastPath.kt

@@ -24,8 +24,15 @@ object ProotFastPath {
     /** MAX_BINDS in fastpath.c: past it the library turns itself off, so the session keeps it off. */
     const val MAX_BINDS = 256
 
+    /**
+     * Only the app's own proot (libproot.so, built with patches/0014) lets the trampoline through.
+     * The runtime's fallback copy (LinuxRuntime.prootBinary) is Termux's, which traps those calls
+     * too and translates their host paths a second time: every lookup then fails inside the
+     * process and goes to proot anyway, paying for both.
+     */
     fun enabled(context: Context): Boolean =
-        SessionPrefs.prootFastPath(context) && !SessionPrefs.prootNoSeccomp(context)
+        SessionPrefs.prootFastPath(context) && !SessionPrefs.prootNoSeccomp(context) &&
+            LinuxRuntime.prootBinary(context).parent == context.applicationInfo.nativeLibraryDir
 
     /** The key for this rootfs and these binds, or null when the library cannot be told them. */
     fun key(root: File, binds: List<String>): String? {