Remove some more -Wstrict-prototypes warnings.

programs/regedit/regproc.c

@@ -557,7 +557,7 @@ HKEY getRegClass(LPSTR lpClass)
 /******************************************************************************
  * Close the currently opened key.
  */
-void closeKey()
+void closeKey(void)
 {
     RegCloseKey(currentKeyHandle);
 

programs/regedit/regproc.h

@@ -41,7 +41,7 @@ BOOL import_registry_file(LPTSTR filename);
 void delete_registry_key(CHAR *reg_key_name);
 
 void setAppName(const CHAR *name);
-const CHAR *getAppName();
+const CHAR *getAppName(void);
 
 void processRegLines(FILE *in, CommandAPI command);
 
@@ -59,7 +59,7 @@ HKEY    getRegClass(LPSTR lpLine);
 DWORD   getDataType(LPSTR *lpValue, DWORD* parse_type);
 LPSTR   getArg(LPSTR arg);
 HRESULT openKey(LPSTR stdInput);
-void    closeKey();
+void    closeKey(void);
 
 /*
  * api setValue prototypes