* unwind.c (build_mmap_cache): For each memory mapping being scanned,
save its PROT_EXEC bit and skip the mapping if it is not set.

* unwind.c (build_mmap_cache): Move local variables to the code branch
where they are used.  Check return code of sscanf and strdup.  Do not
treat unusual memory mappings as fatal errors.  Do not skip memory
mappings with path names starting with "[".

* unwind.c (mmap_cache_t): Remove "deleted" field.
(build_mmap_cache): Remove initialization of "deleted" field.

* unwind.c (stacktrace_walk): Move stack frame printing code
to separate function print_stack_frame.

* unwind.c (call_action_fn, print_call_cb, sprint_call_or_error,
queue_put, queue_put_call): Add const qualifier to binary_filename and
symbol_name arguments.

* unwind.c (unwind_cache_invalidate, unwind_print_stacktrace,
unwind_capture_stacktrace): Disable stack tracing of non-default
personality processes.

* unwind.c (call_action_fn, stacktrace_walk, STACK_ENTRY_SYMBOL_FMT,
print_call_cb, sprint_call_or_error, queue_put, queue_put_call):
Rename function_off_set to function_offset.

* unwind.c (print_stacktrace): Fix another off-by-one error in binary search.

* unwind.c (fopen_for_input): Define to fopen64 iff
[_LARGEFILE64_SOURCE && HAVE_FOPEN64], otherwise define it to fopen.
(build_mmap_cache): Use fopen_for_input instead of fopen.

Fix compilation warnings in unwind.c on 32-bit architectures.
On some architectures getuid is actually getuid32, so change the test
to use getpid instead of getuid.

* unwind.c (STACK_ENTRY_SYMBOL_FMT): Explicitly cast function_off_set
to unsigned long.
(queue_put_error): Change the 3rd argument's type to unsigned long.
* tests/stack-fcall.c (f1): Use getpid instead of getuid.
* tests/strace-k.test: Likewise.