Fix #include <uv.h> mixing between C and C++ modes

include/mbgl/util/uv-messenger.h

@@ -1,12 +1,12 @@
 #ifndef MBGL_UTIL_UV_MESSENGER
 #define MBGL_UTIL_UV_MESSENGER
 
+#include <uv.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include <uv.h>
-
 typedef struct uv_messenger_s uv_messenger_t;
 typedef void (*uv_messenger_cb)(void *arg);
 typedef void (*uv_messenger_stop_cb)(uv_messenger_t *msgr);

src/mbgl/util/uv-channel.h

@@ -1,12 +1,12 @@
 #ifndef MBGL_UTIL_UV_CHANNEL
 #define MBGL_UTIL_UV_CHANNEL
 
+#include <uv.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include <uv.h>
-
 // Taken from http://navaneeth.github.io/blog/2013/08/02/channels-in-libuv/
 
 typedef struct uv_chan_s uv_chan_t;

src/mbgl/util/uv-worker.h

@@ -1,14 +1,14 @@
 #ifndef MBGL_UTIL_UV_WORKER
 #define MBGL_UTIL_UV_WORKER
 
-#ifdef __cplusplus
-extern "C" {
-#endif
+#include <stdlib.h>
 
 #include <mbgl/util/uv-messenger.h>
 #include <mbgl/util/uv-channel.h>
 
-#include <stdlib.h>
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 typedef struct uv_worker_s uv_worker_t;