libuv: Most of the functions in uv.pxd don't need GIL

Author: 1st1

uvloop/handles/handle.pyx

@@ -319,7 +319,7 @@ cdef void __uv_close_handle_cb(uv.uv_handle_t* handle) with gil:
 cdef void __close_all_handles(Loop loop):
     uv.uv_walk(loop.uvloop, __uv_walk_close_all_handles_cb, <void*>loop) # void
 
-cdef void __uv_walk_close_all_handles_cb(uv.uv_handle_t* handle, void* arg):
+cdef void __uv_walk_close_all_handles_cb(uv.uv_handle_t* handle, void* arg) with gil:
     cdef:
         Loop loop = <Loop>arg
         UVHandle h

uvloop/includes/uv.pxd

@@ -4,7 +4,7 @@ from posix.types cimport gid_t, uid_t
 from . cimport system
 
 
-cdef extern from "../vendor/libuv/include/uv.h":
+cdef extern from "../vendor/libuv/include/uv.h" nogil:
     cdef int UV_EACCES
     cdef int UV_EAGAIN
     cdef int UV_EALREADY
@@ -179,7 +179,7 @@ cdef extern from "../vendor/libuv/include/uv.h":
     const char* uv_err_name(int err)
 
     # no "with gil" for uv_walk_cb, as uv_walk doesn't release GIL
-    ctypedef void (*uv_walk_cb)(uv_handle_t* handle, void* arg)
+    ctypedef void (*uv_walk_cb)(uv_handle_t* handle, void* arg) with gil
 
     ctypedef void (*uv_close_cb)(uv_handle_t* handle) with gil
     ctypedef void (*uv_idle_cb)(uv_idle_t* handle) with gil