Do not run gcount test on any *armv7l* (fixes test on llvm-clang-win-x-armv7l)

[azat]

Summary

There was one buildbot (for llvm-clang-win-x-armv7l) that hadn't been
run for the initial revision [1].

[1]: https://lab.llvm.org/buildbot#builders/60/builds/12118

[azat]

Fix regex

[ldionne]

LGTM, the CI failures seem unrelated.

[azat]

@ldionne thanks. I guess someone should land it for me, right?

[Mordante]

In D150886#4357343, @azat wrote:

@ldionne thanks. I guess someone should land it for me, right?

Thanks for the patch, I landed it on your behalf.

libcxx/test/std/input.output/string.streams/stringstream.members/gcount.pass.cpp

 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // All 32 bit arches that CI has:
 //
 // UNSUPPORTED: target=powerpc-ibm-aix
-// UNSUPPORTED: target=armv7l-linux-gnueabihf
-// UNSUPPORTED: target=armv8l-linux-gnueabihf
+// UNSUPPORTED: target={{.*}}armv7l{{.*}}
+// UNSUPPORTED: target={{.*}}armv8l{{.*}}
 // UNSUPPORTED: target=i686-w64-windows-gnu
 
 // Test that tellp() does not break the stringstream after INT_MAX, due to use
 // of pbump() that accept int.
 
 #include <cassert>
 #include <climits>
 #include <sstream>