- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

strcmp(3) will suffice here, also follow the style of the remaining file more closely.

Prodded by: ed

Apply local patches to mandoc and connect it to the build.

- adds a couple more library strings used in the tree
- changes some more to the current groff spelling
- changes page footer to match groff style

Merge mandoc from vendor into contrib and provide the necessary Makefile glue.

It's not yet connected to the build.

Vendor import of mdocml 1.12.1

It is a suite of ISC licensed tools to compile and render mdoc/man pages and
will replace groff for formatting manpages in the base system.

http://mdocml.bsd.lv/