Use __ANDROID__ instead of __BRILLO__.

__ANDROID__ is defined automatically by the toolchain.

Bug: 23358460
Change-Id: Ieea8035dc1ad7d8dbdbe91936b364d8c15f447dc
diff --git a/libminijail.c b/libminijail.c
index 109bcdc..26186e3 100644
--- a/libminijail.c
+++ b/libminijail.c
@@ -683,7 +683,7 @@
 
 void drop_caps(const struct minijail *j)
 {
-#if defined(__BRILLO__)
+#if defined(__ANDROID__)
 	/*
 	 * Temporarily disable capabilities support until Minijail can use
 	 * libcap-ng.
@@ -951,7 +951,7 @@
 
 int setup_preload(void)
 {
-#if defined(__BRILLO__)
+#if defined(__ANDROID__)
 	/* Don't use LDPRELOAD on Brillo. */
 	return 0;
 #else