Fix build on Windows

components/profile/lib.rs

@@ -8,6 +8,7 @@
 #![feature(plugin)]
 #![plugin(plugins)]
 
+#[cfg(not(target_os = "windows"))]
 extern crate alloc_jemalloc;
 extern crate hbs_pow;
 extern crate ipc_channel;

components/profile/mem.rs

@@ -463,6 +463,7 @@ mod system_reporter {
                    newp: *mut c_void, newlen: size_t) -> c_int;
     }
 
+    #[cfg(not(target_os = "windows"))]
     fn jemalloc_stat(value_name: &str) -> Option<usize> {
         // Before we request the measurement of interest, we first send an "epoch"
         // request. Without that jemalloc gives cached statistics(!) which can be
@@ -498,6 +499,11 @@ mod system_reporter {
         Some(value as usize)
     }
 
+    #[cfg(target_os = "windows")]
+    fn jemalloc_stat(value_name: &str) -> Option<usize> {
+        None
+    }
+
     // Like std::macros::try!, but for Option<>.
     macro_rules! option_try(
         ($e:expr) => (match $e { Some(e) => e, None => return None })