Disable 'attribute "foo" ignored' warnings from icc

ICC lies about the version of gcc it emulates, which results
in unsupported attributes sometimes being used.  The warning
is an annoyance and should be disabled.

Signed-off-by: Mans Rullgard <mans@mansr.com>

configure

@@ -2987,10 +2987,11 @@ if enabled icc; then
     check_cflags -w1
     # -wd: Disable following warnings
     # 144, 167, 556: -Wno-pointer-sign
+    # 1292: attribute "foo" ignored
     # 10006: ignoring unknown option -fno-signed-zeros
     # 10148: ignoring unknown option -Wno-parentheses
     # 10156: ignoring option '-W'; no argument required
-    check_cflags -wd144,167,556,10006,10148,10156
+    check_cflags -wd144,167,556,1292,10006,10148,10156
     # 11030: Warning unknown option --as-needed
     # 10156: ignoring option '-export'; no argument required
     check_ldflags -wd10156,11030