v5.0.x: configury: remove whitespace from "conftestval"-style tests #13289
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Several configure tests write integer result values to files and then do something like foo=$(cat conftestval). However, if the conftestval file contains whitespace around the integer value (e.g., if conftestval was written by a Fortran test code), then $foo will still contain that whitespace, too -- which then propagates throughout the configury and elsewhere.
This commit uses xargs to strip off the whitespace. There's really only one place where this is happening that is a problem, but let's do it in all places where we foo=$(cat conftestval) with integer results, just as a matter of consistency and defensive programming.
Thanks to Lisandro Dalcin (@dalcinl) for raising the issue.
Fixes #13285.
This is the v5.0.x PR corresponding to main PR #13286