package/perl-dbd-mysql: fix runtime issue with MariaDB

Now that the TestPerlDBDmysql can be run normally, a new runtime issue
appear due to switch from oracle-mysql to MariaDB:

  # perl -MDBI -e '1'
  # echo $?
  0

  # perl -MDBD::mysql -e '1'
  Can't load '/usr/lib/perl5/site_perl/5.38.2/arm-linux/auto/DBD/mysql/mysql.so'
  for module DBD::mysql: /usr/lib/perl5/site_perl/5.38.2/arm-linux/auto/DBD/mysql/mysql.so:
  undefined symbol: net_buffer_length at /usr/lib/perl5/5.38.2/arm-linux/DynaLoader.pm line 206.

This is fixed by an upstream commit [1] from 4.046_01 release.

[1] 0f0cebe87f

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/6735654506

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/perl-dbd-mysql/0001-Use-net_buffer_length-macro-if-available.patch

@@ -0,0 +1,41 @@
+From 9189ef77679c22de3bbd2142031858373236520b Mon Sep 17 00:00:00 2001
+From: Michiel Beijen <michiel.beijen@gmail.com>
+Date: Fri, 23 Feb 2018 07:52:33 +0000
+Subject: [PATCH] Use net_buffer_length macro if available
+
+Upstream: https://github.com/perl5-dbi/DBD-mysql/commit/0f0cebe87fab335873fd3701bc304922da826940
+
+(cherry picked from commit 0f0cebe87fab335873fd3701bc304922da826940)
+Signed-off-by: Romain Naour <romain.naour@smile.fr>
+---
+ mysql.xs | 11 +++++------
+ 1 file changed, 5 insertions(+), 6 deletions(-)
+
+diff --git a/mysql.xs b/mysql.xs
+index 8edee55..9b4d60f 100644
+--- a/mysql.xs
++++ b/mysql.xs
+@@ -819,15 +819,14 @@ dbd_mysql_get_info(dbh, sql_info_type)
+ 	    retsv = newSVpvn("`", 1);
+ 	    break;
+ 	case SQL_MAXIMUM_STATEMENT_LENGTH:
+-#if !defined(MARIADB_BASE_VERSION) && MYSQL_VERSION_ID >= 50709
+-        /* MariaDB 10 is not MySQL source level compatible so this
+-           only applies to MySQL*/
+-	    /* mysql_get_option() was added in mysql 5.7.3 */
+-	    /* MYSQL_OPT_NET_BUFFER_LENGTH was added in mysql 5.7.9 */
++        /* net_buffer_length macro is not defined in MySQL 5.7 and some MariaDB
++        versions - if it is not available, use newer mysql_get_option */
++#if !defined(net_buffer_length)
++            ;
++	    unsigned long buffer_len;
+ 	    mysql_get_option(NULL, MYSQL_OPT_NET_BUFFER_LENGTH, &buffer_len);
+ 	    retsv = newSViv(buffer_len);
+ #else
+-	    /* before mysql 5.7.9 use net_buffer_length macro */
+ 	    retsv = newSViv(net_buffer_length);
+ #endif
+ 	    break;
+-- 
+2.44.0
+