Revert "[libcxx][test] Fix a test for the range of file offsets on ARMv7 Linux targets.

Test to see how the CI fares with this XFAIL removed, on some of
the other CI configurations (where it was unclear whether they were
executed or not before).

Author: mstorsjo

libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/offset_range.pass.cpp

@@ -28,11 +28,6 @@
 //
 // XFAIL: target=powerpc-{{.+}}-aix{{.*}}
 
-// By default, off_t is typically a 32-bit integer on ARMv7 Linux systems,
-// meaning it can represent file sizes up to 2GB (2^31 bytes) only.
-//
-// UNSUPPORTED: target=armv7-unknown-linux-gnueabihf
-
 #include <fstream>
 #include <iostream>
 #include <cassert>