pkg/59400: mpdecimal: update to version 4.0.1

[skrah%bytereef.org@localhost]

>Number:         59400
>Category:       pkg
>Synopsis:       mpdecimal: update to version 4.0.1
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Tue May 06 15:55:00 +0000 2025
>Originator:     Stefan Krah
>Release:        10.1
>Organization:
>Environment:
>Description:
mpdecimal-4.0.1 has been released:

   https://www.bytereef.org/mpdecimal/changelog.html

   https://www.bytereef.org/software/mpdecimal/releases/mpdecimal-4.0.1.tar.gz


It would be nice to update the package. The version is ABI compatible
with 4.0.0.

patches/patch-configure can be removed, since version 4.0.1 uses libdir
instead of RPATH for the install_name on macOS. 

>How-To-Repeat:

>Fix: