Add x86_64-linux-icc target to build VP8 with icc

Add a target for icc.

Change-Id: Ia1db82373d9c7268848bbb65c9483d408b9d933f
diff --git a/configure b/configure
index 9a3269a..f68f018 100755
--- a/configure
+++ b/configure
@@ -109,6 +109,7 @@
 all_platforms="${all_platforms} x86-win32-vs8"
 all_platforms="${all_platforms} x86_64-darwin9-gcc"
 all_platforms="${all_platforms} x86_64-linux-gcc"
+all_platforms="${all_platforms} x86_64-linux-icc"
 all_platforms="${all_platforms} x86_64-solaris-gcc"
 all_platforms="${all_platforms} x86_64-win64-vs8"
 all_platforms="${all_platforms} universal-darwin8-gcc"