Make is_android static

util.h gets included from more than one place on Chrome OS builds.

Change-Id: I021235738115782fc2966d51fe356364953db169
Signed-off-by: Dylan Reid <dgreid@chromium.org>
diff --git a/util.h b/util.h
index 069090f..0cc1d15 100644
--- a/util.h
+++ b/util.h
@@ -29,7 +29,7 @@
 extern const char *log_syscalls[];
 extern const size_t log_syscalls_len;
 
-inline int is_android() {
+static inline int is_android() {
 #if defined(__ANDROID__)
 	return 1;
 #else