Upstream PR: https://github.com/MariaDB/server/pull/1081

From d2cbf56d36e422802aa7e53ec0f4e6be8fd53cf5 Mon Sep 17 00:00:00 2001
From: Honza Horak <hhorak@redhat.com>
Date: Wed, 9 Jan 2019 20:17:29 +0100
Subject: [PATCH] Make the PYTHON_SHEBANG value configurable

In Fedora 30 it is required to specify either /usr/bin/python2 or /usr/bin/python3 in the shebang, so we need a way to say explicit shebang, ideally in the cmake call.
---
 CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a139c9e5fa4..ccccb08bef1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -342,7 +342,9 @@ MYSQL_CHECK_SSL()
 MYSQL_CHECK_READLINE()
 
 SET(MALLOC_LIBRARY "system")
-SET(PYTHON_SHEBANG "/usr/bin/env python")
+IF(NOT DEFINED PYTHON_SHEBANG)
+  SET(PYTHON_SHEBANG "/usr/bin/env python")
+ENDIF()
 
 CHECK_PCRE()
 
-- 
2.17.2