-Prefix mysql_ to the real names of several symbols that have to be exported
-from libmysqlclient because mysql-connector-odbc and/or PHP depend on them.
-This limits the intrusion on application namespace.
-
-
-diff -Naur mysql-5.5.8.orig/include/my_sys.h mysql-5.5.8/include/my_sys.h
---- mysql-5.5.8.orig/include/my_sys.h 2010-12-03 12:58:24.000000000 -0500
-+++ mysql-5.5.8/include/my_sys.h 2010-12-27 14:27:23.956926896 -0500
-@@ -227,6 +227,7 @@
+diff -ur percona-server-5.7.28-31.orig/include/m_string.h percona-server-5.7.28-31/include/m_string.h
+--- percona-server-5.7.28-31.orig/include/m_string.h 2019-12-16 23:51:39.761000000 +0100
++++ percona-server-5.7.28-31/include/m_string.h 2019-12-16 23:52:03.126000000 +0100
+@@ -193,6 +193,7 @@
+ extern size_t strnlen(const char *s, size_t n);
+ #endif
+
++#define is_prefix mysql_is_prefix /* namespace sanity */
+ extern int is_prefix(const char *, const char *);
+
+ /* Conversion routines */
+diff -ur percona-server-5.7.28-31.orig/include/my_sys.h percona-server-5.7.28-31/include/my_sys.h
+--- percona-server-5.7.28-31.orig/include/my_sys.h 2019-12-16 23:51:39.762000000 +0100
++++ percona-server-5.7.28-31/include/my_sys.h 2019-12-16 23:52:03.125000000 +0100
+@@ -261,6 +261,7 @@