gopls/internal/regtest/misc: skip TestInconsistentVendoring on Windows
gopls/internal/regtest/misc: skip TestInconsistentVendoring on Windows

This test is probably detecting a real bug that exclusively affects
Windows. To avoid masking other bugs, let's skip the test on that
platform until the bug is fixed.

For golang/go#49646

Change-Id: I38c615d47454ecfd72b416fff2018973b3ae9259
Reviewed-on: https://go-review.googlesource.com/c/tools/+/364676
Trust: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
Run-TryBot: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
gopls-CI: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Robert Findley <9179eee875d1ee628c37fb47d7e749e855ffd21f@google.com>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools