component/perl-DBD-MySQL: use --libs options to set rpath

Makefile.PL supports --libs:

  --libs=<libs>          Use <libs> for running the linker; defaults
                         to the value of "mysql_config --libs" or a gussed
                         value

Instead of patching, use this option, calling manually "mysql_config
--libs" and appending our rpath flags.

Also move `environment` to base part, as it's now same in both
mariadb/mysql versions of the component.

component/perl-DBD-MySQL/DBD-mysql-4.027.rpathsupport.patch

---- DBD-mysql-4.027/Makefile.PL.orig	2014-03-14 19:34:06.000000000 +0100
-+++ DBD-mysql-4.027/Makefile.PL	2014-05-10 07:34:50.497350471 +0200
-@@ -974,7 +974,12 @@
-   delete $params{ABSTRACT_FROM} if $] < 5.005;
-   delete $params{BINARY_LOCATION} if $] < 5.005;
- 
--  ExtUtils::MakeMaker::WriteMakefile(%params);
-+  my %config;
-+  if (defined($ENV{'OTHERLDFLAGS'})) {
-+    $config{dynamic_lib} = { OTHERLDFLAGS => " $ENV{'OTHERLDFLAGS'} " };
-+  }
-+
-+  ExtUtils::MakeMaker::WriteMakefile(%params, %config);
- }
- __DATA__
- 

component/perl-DBD-MySQL/buildout.cfg

@@ -18,23 +18,17 @@ depends =
 url = http://www.cpan.org/modules/by-module/DBD/DBD-mysql-4.042.tar.gz
 md5sum = a144bd950b55af68835d44bc4ea6e5aa
 patches =
-  ${:_profile_base_location_}/DBD-mysql-4.027.rpathsupport.patch#a932982b7725e6621cfce3a3d7917e03
   ${:_profile_base_location_}/DBD-mysql-4.042.mariadb.patch#5864d36d19c4a05034b3a4873f7c659a
-
 patch-options = -p1
+environment =
+  PATH=${patch:location}/bin:%(PATH)s
 
 [perl-DBD-MySQL]
 <= perl-DBD-MySQL-common
 configure-command =
-  ${perl:location}/bin/perl Makefile.PL --mysql_config=${mysql-tritonn-5.0:location}/bin/mysql_config
-environment =
-  OTHERLDFLAGS=-Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${mysql-tritonn-5.0:location}/lib/mysql -Wl,-rpath=${openssl:location}/lib
-  PATH=${patch:location}/bin:%(PATH)s
+  ${perl:location}/bin/perl Makefile.PL --mysql_config=${mysql-tritonn-5.0:location}/bin/mysql_config --libs="-L${zlib:location}/lib -L${openssl:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${mysql-tritonn-5.0:location}/lib/mysql -Wl,-rpath=${openssl:location}/lib $(${mysql-tritonn-5.0:location}/bin/mysql_config --libs)"
 
 [perl-DBD-mariadb]
 <= perl-DBD-MySQL-common
 configure-command =
-  ${perl:location}/bin/perl Makefile.PL --mysql_config=${mariadb:location}/bin/mysql_config
-environment =
-  OTHERLDFLAGS=-L${zlib:location}/lib -L${openssl:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${mariadb:location}/lib -Wl,-rpath=${openssl:location}/lib
-  PATH=${patch:location}/bin:%(PATH)s
+  ${perl:location}/bin/perl Makefile.PL --mysql_config=${mariadb:location}/bin/mysql_config --libs="-L${zlib:location}/lib -L${openssl:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${mariadb:location}/lib/mysql -Wl,-rpath=${openssl:location}/lib $(${mariadb:location}/bin/mysql_config --libs)"