emerge: default --backtrack=10 (bug 540562)

Since the default behavior is now for emerge to terminate early for
autounmask changes (unless either --autounmask-backtrack=y or
--autounmask-continue is enabled), it is much less likely that time
will be wasted by fruitless backtracking. Therefore, raise the default
backtrack value from 3 to 10, restoring it to the value it had prior
to commit 1891388ea0ae0dd58903a71a3adc779731523601 (see bug 536926).
This will allow many users to avoid having to manually raise the
--backtrack value.

X-Gentoo-bug: 540562
X-Gentoo-bug-url: https://bugs.gentoo.org/show_bug.cgi?id=540562
Acked-by: Brian Dolbec <dolsen@gentoo.org>
2 files changed