GH-43808: [C++] set kStrptimeSupportsZone to false for old glibc

[h-vetinari]

Rationale for this change

Enable tests for libarrow in conda-forge: #35587

What changes are included in this PR?

old glibc does not actually support whatever kStrptimeSupportsZone does; I first wanted to StrptimeZoneOffset, but given that it already has a skip, it seems more reasonable to just use that.

arrow/cpp/src/arrow/util/value_parsing_test.cc

Lines 829 to 832 in 11c11a4

	TEST(TimestampParser, StrptimeZoneOffset) {
	if (!kStrptimeSupportsZone) {
	GTEST_SKIP() << "strptime does not support %z on this platform";
	}

The exact lower bound for glibc is hard for me to determine; I know that it passes with 2.28 and that it fails with 2.17. Anything in between is an open question. I went with the conservative option here.

Are these changes tested?

Tested in conda-forge/arrow-cpp-feedstock#1058

Are there any user-facing changes?

• GitHub Issue: [C++] Skip TimestampParser.StrptimeZoneOffset with old glibc #43808

[github-actions]

⚠️ GitHub issue #43808 has been automatically assigned in GitHub to PR creator.