Unified sysroot: arch-X/include directories are gone.

Bug: N/A
Test: builds
Change-Id: I98fc6a1a3c0be1c90b1deb35b54f36ab16a202ac
diff --git a/cc/config/x86_device.go b/cc/config/x86_device.go
index 23518b6..53d2265 100644
--- a/cc/config/x86_device.go
+++ b/cc/config/x86_device.go
@@ -181,7 +181,7 @@
 	pctx.StaticVariable("X86Cflags", strings.Join(x86Cflags, " "))
 	pctx.StaticVariable("X86Ldflags", strings.Join(x86Ldflags, " "))
 	pctx.StaticVariable("X86Cppflags", strings.Join(x86Cppflags, " "))
-	pctx.StaticVariable("X86IncludeFlags", bionicHeaders("x86", "x86"))
+	pctx.StaticVariable("X86IncludeFlags", bionicHeaders("x86"))
 
 	// Clang cflags
 	pctx.StaticVariable("X86ClangCflags", strings.Join(ClangFilterUnknownCflags(x86ClangCflags), " "))