linux: Update to 3.12.24

CVE-2014-4508, CVE-2014-0206.

(cherry picked from commit 1596c3a012517297d98f0c94a17249e2397213bf)
Manual: html -> xhtml

(cherry picked from commit 2737291b5d925c13aee4ac4180983f4edc925625)
gperftools: Support Darwin

(cherry picked from commit 63aff93c9b0711255c05261f5935af9d06b23c08)