Fix x86 build.

Change-Id: I1f2d8189bec3d0e25d21ca7d7bd73fd02f8678e2
diff --git a/libc/bionic/statvfs.cpp b/libc/bionic/statvfs.cpp
index 5d42aaa..743e4fd 100644
--- a/libc/bionic/statvfs.cpp
+++ b/libc/bionic/statvfs.cpp
@@ -23,7 +23,7 @@
 
 #define ST_VALID 0x0020
 
-#if defined(__mips__)
+#if !defined(__arm__)
 #define __val val
 #endif