icc 9.0 when compiling its generated code for its own FD_SET,

FD_ISSET, and FD_ZERO macros emits warnings #1469 and #593.
So for icc 9.0 we also ignore warnings #1469 and #593.
* 593 warns on "variable __d0 was set but never used"
* 1469 warns on "cc clobber ignored"

acinclude.m4

@@ -1350,6 +1350,16 @@ AC_DEFUN([CURL_CC_DEBUG_OPTS],
 
          WARN="-wd279,269,981,1418,1419"
 
+         if test "$gccnum" -eq "900"; then
+            dnl icc 9.0 when compiling its generated code for its own FD_SET,
+            dnl FD_ISSET, and FD_ZERO macros emits warnings #1469 and #593.
+            dnl So for icc 9.0 we also ignore warnings #1469 and #593.
+            dnl * 593 warns on "variable __d0 was set but never used"
+            dnl * 1469 warns on "cc clobber ignored"
+            dnl
+            WARN="$WARN,593,1469"
+         fi
+
          if test "$gccnum" -gt "600"; then
             dnl icc 6.0 and older doesn't have the -Wall flag
             WARN="-Wall $WARN"