util/path: Fix type which is longer than 8 bit for MinGW

While dirent->d_type is 8 bit for most systems, it is 32 bit for MinGW.
Reducing it to 8 bit results in a compiler warning because the macro
is_dir_maybe compares that 8 bit value with 32 bit constants.

Using 'unsigned' instead of 'unsigned char' matches the declaration for
MinGW and does not harm the other systems.

MinGW-w64 is not affected: it does not declare d_type.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

util/path.c

diff --git a/util/path.c b/util/path.c
index f0c6962..623219e 100644
--- a/util/path.c
+++ b/util/path.c
@@ -39,7 +39,7 @@
 }
 
 static struct pathelem *add_entry(struct pathelem *root, const char *name,
-                                  unsigned char type);
+                                  unsigned type);
 
 static struct pathelem *new_entry(const char *root,
                                   struct pathelem *parent,
@@ -82,7 +82,7 @@
 }
 
 static struct pathelem *add_entry(struct pathelem *root, const char *name,
-                                  unsigned char type)
+                                  unsigned type)
 {
     struct pathelem **e;