config/zfs-build.m4: add --with-vendor flag

This will allow an override of auto-detection of distribution, which
is based on checking presence of /etc/*-release files.

Build systems makes a lot of file location assumptions based on
detected distribution.

Some distributions (like gentoo) may prefer explicitly
setting --with-vendor=gentoo to avoid auto-detection.

Since auto-detection checks all files in order, current script may
misdetect even on gentoo system if /etc/redhat-release file is present

Default behavior is unchanged and default is --with-vendor=check

Reviewed-by: Ryan Moeller <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Georgy Yakovlev <[email protected]>
Closes #10835 

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