nacl-mounts: Fix build on newlib

libraries/nacl-mounts/test.nacl/DevTest.cc

Index: libraries/nacl-mounts/test.nacl/DevTest.cc
===================================================================
--- libraries/nacl-mounts/test.nacl/DevTest.cc	(revision 617)
+++ libraries/nacl-mounts/test.nacl/DevTest.cc	(working copy)
@@ -8,7 +8,9 @@
 
 #include <fcntl.h>
 #include <sys/types.h>
+#ifdef __GLIBC__
 #include <sys/select.h>
+#endif
 #include <sys/stat.h>
 #include <unistd.h>
 
@@ -32,6 +34,7 @@
   EXPECT_EQ(0, read(q, reinterpret_cast<void*>(buff), 5));
 }
 
+#ifdef __GLIBC__
 TEST(DevTest, Select) {
   int random = open("/dev/random", O_RDONLY);
   EXPECT_GT(random, 0);
@@ -63,3 +66,4 @@
   EXPECT_FALSE(FD_ISSET(random, &exceptfds));
   EXPECT_FALSE(FD_ISSET(null, &exceptfds));
 }
+#endif  // __GLIBC__