Install README.pod into DBD/MariaDB/ subdirectory

Older versions of ExtUtils::MakeMaker install README.pod file into location
lib/DBD/README.pod. It is wrong place which may conflicts with other DBI or
DBD modules.

Proper fix is to explicitly specify in ExtUtils::MakeMaker configuration
which modules and manpages should be installed and where they should be
installed.

Fixes: #146

Author: pali

Makefile.PL

@@ -450,6 +450,17 @@ my %o = ( 'NAME' => 'DBD::MariaDB',
 		'realclean' => { 'FILES' => 't/MariaDB.mtest' },
           'C' => ["dbdimp.c", "MariaDB.c", "socket.c"],
           'XS' => {'MariaDB.xs' => 'MariaDB.c'},
+          'PM' => {
+              'lib/DBD/MariaDB.pm' => '$(INST_LIB)/DBD/MariaDB.pm',
+              'lib/DBD/MariaDB.pod' => '$(INST_LIB)/DBD/MariaDB.pod',
+              'lib/DBD/MariaDB/INSTALL.pod' => '$(INST_LIB)/DBD/MariaDB/INSTALL.pod',
+              'README.pod' => '$(INST_LIB)/DBD/MariaDB/README.pod',
+          },
+          'MAN3PODS' => {
+              'lib/DBD/MariaDB.pod' => '$(INST_MAN3DIR)/DBD::MariaDB.$(MAN3EXT)',
+              'lib/DBD/MariaDB/INSTALL.pod' => '$(INST_MAN3DIR)/DBD::MariaDB::INSTALL.$(MAN3EXT)',
+              'README.pod' => '$(INST_MAN3DIR)/DBD::MariaDB::README.$(MAN3EXT)',
+          },
 	  'OBJECT' => '$(O_FILES)',
 	  'LIBS' => (join ' ', @libdirs, $main_lib, @libs),
 	  @ldflags ? (dynamic_lib => { OTHERLDFLAGS => (join ' ', @ldflags) }) : (),