update sysutils/mcelog to 148

• Intel Xeons from Ivy Bridge onwards support a processor identification number.
• Fix warning with gcc 6.x
• replace asprintf with xasprintf as per memutil.c
• Return -ENOMEM for vasprintf in sysfs_write

PR: 216789
Submitted by: ultima1252@gmail.com (maintainer)
Reviewed by: matthew
Approved by: matthew (mentor)
Differential Revision: https://reviews.freebsd.org/D9454