Issue with sprintf in Makefile.PL on Windows.

Patch by Zeeshan, from RT#82768.
Fixes RT#67280.
POD fixes.

Patch from RT77043 by Gunnar Wolf, Debian Perl Group.
Minor spelling fixes.

Fixes RT#77044 by fregor herrmann, Debian Perl Group.
Also fixed some additional typos.
Fix memory leak if mysql_server_prepare is enabled.

Fixes MySQL bug#41815, RT#76462.
Patch provided by KNI and Masahiro Chiba.
Merge pull request #40 from mbeijen/RT82768

Issue with sprintf in Makefile.PL on Windows.
Merge pull request #41 from mbeijen/RT77043

POD fixes.
Merge pull request #42 from mbeijen/RT77044

Minor spelling fixes.
Merge pull request #43 from mbeijen/RT76462

Fix memory leak if mysql_server_prepare is enabled.