Add missing export of fallocate64 on 32-bit platforms.

Due to a pasto the fallocate64 interface, introduced in glibc 2.10,
isn't exported for 32-bit Linux platforms.  It is too late for this
now so exported them for glibc 2.11.

sysdeps/unix/sysv/linux/i386/Versions

@@ -41,6 +41,10 @@ libc {
     # v*
     vm86;
   }
+  GLIBC_2.11 {
+    # f*
+    fallocate64;
+  }
   GLIBC_PRIVATE {
     __modify_ldt;
   }