Issue #19296: Silence compiler warning in dbm_open.

Some dbm header files declare the first argument as char * instead of a const char *.

Misc/NEWS

@@ -18,6 +18,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #19296: Silence compiler warning in dbm_open
+
 - Issue #19839: Fix regression in bz2 module's handling of non-bzip2 data at
   EOF, and analogous bug in lzma module.
 

Modules/_dbmmodule.c

@@ -66,7 +66,8 @@ newdbmobject(const char *file, int flags, int mode)
     if (dp == NULL)
         return NULL;
     dp->di_size = -1;
-    if ( (dp->di_dbm = dbm_open(file, flags, mode)) == 0 ) {
+    /* See issue #19296 */
+    if ( (dp->di_dbm = dbm_open((char *)file, flags, mode)) == 0 ) {
         PyErr_SetFromErrno(DbmError);
         Py_DECREF(dp);
         return NULL;