[PATCH 2/3] apply.h: include missing header

[Denton Liu]

When running `make hdr-check`, we got the following error messages:

        apply.h:146:22: error: use of undeclared identifier 'GIT_MAX_HEXSZ'
                char old_oid_prefix[GIT_MAX_HEXSZ + 1];
                                    ^
        apply.h:147:22: error: use of undeclared identifier 'GIT_MAX_HEXSZ'
                char new_oid_prefix[GIT_MAX_HEXSZ + 1];
                                    ^
        apply.h:151:33: error: array has incomplete element type 'struct 
object_id'
                struct object_id threeway_stage[3];
                                               ^
        ./strbuf.h:79:8: note: forward declaration of 'struct object_id'
        struct object_id;
               ^
        3 errors generated.
        make: *** [apply.hco] Error 1

Include the missing "hash.h" header to fix these errors.

Signed-off-by: Denton Liu <liu.den...@gmail.com>
---
 apply.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/apply.h b/apply.h
index a795193435..da3d95fa50 100644
--- a/apply.h
+++ b/apply.h
@@ -1,6 +1,7 @@
 #ifndef APPLY_H
 #define APPLY_H
 
+#include "hash.h"
 #include "lockfile.h"
 #include "string-list.h"
 
-- 
2.23.0.565.g1cc52d20df