Fixed build of manpages

To build manpages run cmake with option -DWITH_DOCS=ON.
Creation of man pages requires Python3 and Docygen.

The bundled manpaes were removed from repository.

man/mysql_sqlstate.3

@@ -1,37 +0,0 @@
-.\" Automatically generated by Pandoc 2.5
-.\"
-.TH "mysql_sqlstate" "3" "" "Version 3.3.1" "MariaDB Connector/C"
-.hy
-.SS Name
-.PP
-mysql_sqlstate \- returns SQLSTATE error code
-.SS Synopsis
-.IP
-.nf
-\f[C]
-#include <mysql.h>
-
-const char * mysql_sqlstate(MYSQL * mysql);
-\f[R]
-.fi
-.SS Description
-.PP
-Returns a string containing the SQLSTATE error code for the most
-recently invoked function that can succeed or fail.
-The error code consists of five characters.
-`00000' means no error.
-The values are specified by ANSI SQL and ODBC
-.SS Parameter
-.SS Notes
-.PP
-Please note that not all client library error codes are mapped to
-SQLSTATE errors.
-Errors which can\[cq]t be mapped will returned as value HY000.
-.SS Return value
-.PP
-A string containing SQLSTATE error code.
-.SS See also
-.IP \[bu] 2
-\f[B]mysql_error(3)\f[R]
-.IP \[bu] 2
-\f[B]mysql_errno(3)\f[R]