Suppress icc warnings about unknown attributes

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@21884 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -2715,7 +2715,7 @@ if enabled icc; then
     # 144, 167, 556: -Wno-pointer-sign
     # 10006: ignoring unknown option -fno-signed-zeros
     # 10156: ignoring option '-W'; no argument required
-    check_cflags -wd144,167,556,10006,10156
+    check_cflags -wd144,167,556,1292,10006,10156
     # 11030: Warning unknown option --as-needed
     # 10156: ignoring option '-export'; no argument required
     check_ldflags -wd10156,11030