compat/terminal: header-fixup

getch is declared in conio.h, which was only included from
compat/mingw.c and compat/msvc.c.

Fix this, by moving the inclusion of getch to git-compat-util.h
instead.

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>

compat/mingw.c

@@ -1,6 +1,5 @@
 #include "../git-compat-util.h"
 #include "win32.h"
-#include <conio.h>
 #include <wchar.h>
 #include "../strbuf.h"
 #include "../run-command.h"

compat/msvc.c

@@ -1,6 +1,5 @@
 #include "../git-compat-util.h"
 #include "win32.h"
-#include <conio.h>
 #include "../strbuf.h"
 
 #include "mingw.c"

git-compat-util.h

@@ -90,6 +90,7 @@
 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
 #include <winsock2.h>
 #include <windows.h>
+#include <conio.h>
 #endif
 
 #include <unistd.h>