mailmap, quote: move declarations of global vars to correct unit

Since earlier commits removed the inclusion of cache.h from mailmap.c
and quote.c, it feels odd to have the extern declarations of
global variables in cache.h rather than the actual header included
by the source file.  Move these global variable extern declarations
from cache.h to mailmap.c and quote.c.

Signed-off-by: Elijah Newren <newren@gmail.com>
Acked-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache.h

@@ -599,8 +599,6 @@ void set_alternate_index_output(const char *);
 extern int verify_index_checksum;
 extern int verify_ce_order;
 
-extern int quote_path_fully;
-
 #define MTIME_CHANGED	0x0001
 #define CTIME_CHANGED	0x0002
 #define OWNER_CHANGED	0x0004
@@ -655,9 +653,6 @@ struct pack_entry {
 /* Dumb servers support */
 int update_server_info(int);
 
-extern const char *git_mailmap_file;
-extern const char *git_mailmap_blob;
-
 #define COPY_READ_ERROR (-2)
 #define COPY_WRITE_ERROR (-3)
 int copy_fd(int ifd, int ofd);

config.c

@@ -18,6 +18,7 @@
 #include "ident.h"
 #include "repository.h"
 #include "lockfile.h"
+#include "mailmap.h"
 #include "exec-cmd.h"
 #include "strbuf.h"
 #include "quote.h"

mailmap.h

@@ -3,6 +3,9 @@
 
 struct string_list;
 
+extern const char *git_mailmap_file;
+extern const char *git_mailmap_blob;
+
 int read_mailmap(struct string_list *map);
 void clear_mailmap(struct string_list *map);
 

quote.h

@@ -3,6 +3,8 @@
 
 struct strbuf;
 
+extern int quote_path_fully;
+
 /* Help to copy the thing properly quoted for the shell safety.
  * any single quote is replaced with '\'', any exclamation point
  * is replaced with '\!', and the whole thing is enclosed in a