Add some missing #includes.

My experimental build with clang-cl at -Wall did show up a few things
that are safe enough to fix right now. One was this list of missing
includes, which was causing a lot of -Wmissing-prototype warnings, and
is a real risk because it means the declarations in headers weren't
being type-checked against the actual function definitions.

Happily, no actual mismatches.

cmake/gitcommit.cmake

@@ -45,6 +45,7 @@ if(OUTPUT_TYPE STREQUAL header)
  * Generated by cmake/gitcommit.cmake.
  */
 
+#include \"putty.h\"
 const char commitid[] = \"${commit}\";
 ")
 elseif(OUTPUT_TYPE STREQUAL halibut)

keygen/mpunsafe.c

@@ -7,6 +7,7 @@
 #include "puttymem.h"
 
 #include "mpint.h"
+#include "mpunsafe.h"
 #include "crypto/mpint_i.h"
 
 /*

psocks.c

@@ -7,6 +7,7 @@
 #include <errno.h>
 
 #include "putty.h"
+#include "storage.h"
 #include "misc.h"
 #include "ssh.h"
 #include "ssh/channel.h"

utils/x11_dehexify.c

@@ -4,6 +4,7 @@
  */
 
 #include "putty.h"
+#include "ssh.h"
 
 void *x11_dehexify(ptrlen hexpl, int *outlen)
 {

utils/x11_identify_auth_proto.c

@@ -4,6 +4,7 @@
  */
 
 #include "putty.h"
+#include "ssh.h"
 
 int x11_identify_auth_proto(ptrlen protoname)
 {

utils/x11_parse_ip.c

@@ -6,6 +6,7 @@
 #include <stdio.h>
 
 #include "putty.h"
+#include "ssh.h"
 
 bool x11_parse_ip(const char *addr_string, unsigned long *ip)
 {

windows/no-jump-list.c

@@ -3,6 +3,8 @@
  * that don't update the jump list.
  */
 
+#include "putty.h"
+
 void add_session_to_jumplist(const char * const sessionname) {}
 void remove_session_from_jumplist(const char * const sessionname) {}
 void clear_jumplist(void) {}

windows/plink.c

@@ -8,6 +8,7 @@
 #include <stdarg.h>
 
 #include "putty.h"
+#include "ssh.h"
 #include "storage.h"
 #include "tree234.h"
 #include "security-api.h"

windows/utils/arm_arch_queries.c

@@ -4,6 +4,7 @@
  */
 
 #include "putty.h"
+#include "ssh.h"
 
 #if !(defined _M_ARM || defined _M_ARM64)
 /*

windows/utils/minefield.c

@@ -11,6 +11,7 @@
  */
 
 #include "putty.h"
+#include "puttymem.h"
 
 #define PAGESIZE 4096
 

windows/utils/platform_get_x_display.c

@@ -4,6 +4,7 @@
  */
 
 #include "putty.h"
+#include "ssh.h"
 
 char *platform_get_x_display(void)
 {

windows/window.c

@@ -14,6 +14,7 @@
 #define COMPILE_MULTIMON_STUBS
 
 #include "putty.h"
+#include "ssh.h"
 #include "terminal.h"
 #include "storage.h"
 #include "putty-rc.h"