The current limit of 100k for the linker hints file is getting a bit
crowded as we now are at about 70k. Bump the limit to 1MB instead
which is still quite a reasonable limit and allows for future growth
of this file and possible future expansion to additional data.

MFC After: 2 weeks


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275261 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f