pager: improve support for various flavors of `more` on Windows Hardcoding 'more' -> 'more.com' means that 'more.exe' from MSYS would need to be configured with its *.exe extension. This will resolve to either one, as cmd.exe would have done if the command ran through the shell. Something that's maybe problematic with this is it comes after 'pageractive' and various ui configs have been set by the calling method. But the other early exits in this method don't undo those changes either.

statfs: avoid static allocation Previously we have "static struct statfs" to return a string. That is not multiple-thread safe. This patch moves the allocation to the caller to address the problem.