eclib m4 script incorrectly checks version

[JohnCremona]

Steps To Reproduce

Run ./configure with a version of eclib installed which is strictly greater than required, and with all of the prerequisites ntl, flint, pari not being built.

Expected Behavior

Configure should conclude that eclib does not need to be built.

Actual Behavior

Configure wrongly decides to build eclib.

Additional Information

In the file spkg-configure.m4 which was changed in #36879 to check for a version recent enough, rather than exactly equal to a specific version, two changes needed to be made but only one was. In line 5 of that file = needs to be >=.

(Thanks to Dima Pasechnik for the diagnosis.)

Environment

- **OS**: ubuntu 22.04
- **Sage Version**: 10.4.rc0

Checklist

• I have searched the existing issues for a bug report that matches the one I want to file, without success.
• I have read the documentation and troubleshoot guide