Patch #1774414: make it possible to use SVK to develop Python.

Python/sysmodule.c

@@ -934,15 +934,17 @@ svnversion_init(void)
 {
 	const char *python, *br_start, *br_end, *br_end2, *svnversion;
 	Py_ssize_t len;
-	int istag;
+	int istag = 0;
 
 	if (svn_initialized)
 		return;
 
 	python = strstr(headurl, "/python/");
-	if (!python)
-		Py_FatalError("subversion keywords missing");
-
+	if (!python) {
+		strcpy(branch, "unknown branch");
+		strcpy(shortbranch, "unknown");
+	}
+	else {
 		br_start = python + 8;
 		br_end = strchr(br_start, '/');
 		assert(br_end);
@@ -955,7 +957,6 @@ svnversion_init(void)
 		if (strncmp(br_start, "trunk", 5) == 0) {
 			strcpy(branch, "trunk");
 			strcpy(shortbranch, "trunk");
-
 		}
 		else if (istag || strncmp(br_start, "branches", 8) == 0) {
 			len = br_end2 - br_start;
@@ -970,6 +971,7 @@ svnversion_init(void)
 			Py_FatalError("bad HeadURL");
 			return;
 		}
+	}
 
 
 	svnversion = _Py_svnversion();