Bug 1652870 - permit DUMP_SYMS to be used when doing Android builds; r=mhentges

It's not immediately obvious to me why we limit this check based on target;
I guess once upon a time there was no ELF or Mach-O support, so we wanted to
ensure people didn't shoot themselves in the foot.  If that's the case,
testing indicates that Mach-O support isn't quite ready for prime-time and
we haven't got all the bits straightened out for our normal Linux builds.
So we're just going to enable it for Android here.

Differential Revision: https://phabricator.services.mozilla.com/D83560

toolkit/moz.configure

@@ -1967,7 +1967,7 @@ set_define('MOZ_RUST_FXA_CLIENT', True, when=rust_fxa_client)
 # ==============================================================
 
 check_prog('DUMP_SYMS', ['dump_syms'], allow_missing=True, paths=toolchain_search_path,
-           when=compile_environment & target_is_windows)
+           when=compile_environment & (target_is_windows | target_is_android))
 
 
 check_prog('PDBSTR', ['pdbstr.exe'], allow_missing=True, paths=toolchain_search_path,