LLVM's libunwind uses EnumProcessModules for locating .eh_frame
sections when unwinding dwarf exceptions (used on i686).

When running wine in docker (without adding custom additional
permissions), EnumProcessModules currently fails as it uses
ReadProcessMemory, which requires the SYS_PTRACE capability.

The current implementation also is slower than necessary (by a
couple orders of magnituide), for accessing the current process.
Currently, unwinding 10000 exception throws with libunwind on i686
takes 24 seconds when run in wine, while it runs in less than 0.1
second with this patch.
Signed-off-by: Martin Storsjo <martin@martin.st>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>