(Cherry-pick commit 1b48276 from 'release-7_4' branch.)
Also, includes 7.4.6 changes
+== [7.4.8] (date not set) ==
+
+* Fix 'missing select.h', 'undefined sigprocmask' compiler errors (Hexagon)
+* Update README about bugs reporting and new releases notification
+* Workaround misspelling in GCC to detect ARMv6KZ platform
+
+
== [7.4.6] 2017-05-18 ==
* Add assertion that double-wide CAS target is aligned (msftc/x86[_64])