Add comments about the BUILD_NATIVE change

This is a significant change and mention of it should have gone into
UPGRADE.txt and CHANGES.
........

Merged revisions 370081 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 370082 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@370083 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -118,6 +118,22 @@ Chan_dahdi changes
  * Added dialtone_detect option for analog ports to disconnect incoming
    calls when dialtone is detected.
 
+------------------------------------------------------------------------------
+--- Functionality changes since Asterisk 10.4.0 ------------------------------
+------------------------------------------------------------------------------
+
+Build System
+------------
+ * The optimization portion of the build system has been reworked to avoid
+   broken builds on certain architectures.  All architecture-specific
+   optimization has been removed in favor of using -march=native to allow gcc
+   to detect the environment in which it is running when possible.  This can
+   be toggled as BUILD_NATIVE under "Compiler Flags" in menuselect.
+
+------------------------------------------------------------------------------
+--- Functionality changes since Asterisk 10.3.0 ------------------------------
+------------------------------------------------------------------------------
+
 Chan_unistim changes
 --------------------
  * Added ability to use multiple lines on phone, so for one device in 

UPGRADE-1.8.txt

@@ -18,6 +18,11 @@
 ===
 ===========================================================
 
+From 1.8.12 to 1.8.13:
+* The complex processor detection and optimization has been removed from
+  the makefile in favor of using native optimization suppport when available.
+  BUILD_NATIVE can be disabled via menuselect under "Compiler Flags".
+
 From 1.8.10 to 1.8.11:
 
 * If no transport is specified in sip.conf, transport will default to UDP.

UPGRADE-10.txt

@@ -19,6 +19,12 @@
 ===
 ===========================================================
 
+From 10.4 to 10.5:
+
+* The complex processor detection and optimization has been removed from
+  the makefile in favor of using native optimization suppport when available.
+  BUILD_NATIVE can be disabled via menuselect under "Compiler Flags".
+
 From 10.2 to 10.3:
 
 * If no transport is specified in sip.conf, transport will default to UDP.