fix previously dead android tests and remove some dangling files

Author: RalfJung

ci/ci.sh

@@ -152,7 +152,7 @@ case $HOST_TARGET in
     # Partially supported targets (tier 2)
     BASIC="empty_main integer heap_alloc libc-mem vec string btreemap" # ensures we have the basics: pre-main code, system allocator
     UNIX="hello panic/panic panic/unwind concurrency/simple atomic libc-mem libc-misc libc-random env num_cpus" # the things that are very similar across all Unixes, and hence easily supported there
-    TEST_TARGET=aarch64-linux-android  run_tests_minimal $BASIC $UNIX time hashmap random thread sync concurrency epoll eventfd
+    TEST_TARGET=aarch64-linux-android  run_tests_minimal $BASIC $UNIX time hashmap random thread sync concurrency epoll eventfd prctl
     TEST_TARGET=wasm32-unknown-unknown run_tests_minimal no_std empty_main wasm # this target doesn't really have std
     TEST_TARGET=thumbv7em-none-eabihf  run_tests_minimal no_std
     ;;

tests/fail-dep/libc/prctl-get-name-buffer-too-small.rs

@@ -5,6 +5,6 @@
 fn main() {
     let mut buf = vec![0u8; 15];
     unsafe {
-        libc::prctl(libc::PR_GET_NAME, buf.as_mut_ptr().cast::<libc::c_char>()); //~ ERROR: memory access failed: expected a pointer to 16 bytes of memory, but got alloc952 which is only 15 bytes from the end of the allocation
+        libc::prctl(libc::PR_GET_NAME, buf.as_mut_ptr().cast::<libc::c_char>()); //~ ERROR: memory access failed
     }
 }

tests/fail-dep/libc/prctl-get-name-buffer-too-small.stderr

@@ -1,18 +1,16 @@
-error: Undefined Behavior: memory access failed: expected a pointer to 16 bytes of memory, but got ALLOC which is only 15 bytes from the end of the allocation
-  --> tests/fail-dep/libc/prctl-threadname.rs:LL:CC
+error: Undefined Behavior: memory access failed: attempting to access 16 bytes, but got ALLOC which is only 15 bytes from the end of the allocation
+  --> tests/fail-dep/libc/prctl-get-name-buffer-too-small.rs:LL:CC
    |
 LL |         libc::prctl(libc::PR_GET_NAME, buf.as_mut_ptr().cast::<libc::c_char>());
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: expected a pointer to 16 bytes of memory, but got ALLOC which is only 15 bytes from the end of the allocation
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
 help: ALLOC was allocated here:
-  --> tests/fail-dep/libc/prctl-threadname.rs:LL:CC
+  --> tests/fail-dep/libc/prctl-get-name-buffer-too-small.rs:LL:CC
    |
 LL |     let mut buf = vec![0u8; 15];
    |                   ^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail-dep/libc/prctl-threadname.rs:LL:CC
    = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace