Failing tests on new Synology DS1821+ server

[Stephen Watt]

Dear GMP-Bugs,

I am getting two failed tests (t-pow, t-root) on the Synology DS1821+.

The particulars are:

* GMP Version: 6.2.1
* Reproduce by:   ./configure ; make ; make check
* Two tests fail. t-pow and t-root.   test-suite.log attached
* No configure options used.
* Output of config attached
* GCC version: gcc version 4.9.3 20150311 (prerelease) (crosstool-NG 1.20.0)
* uname -a output:
Linux Depot 4.4.59+ #25556 SMP Thu Mar 18 12:58:24 CST 2021 x86_64
GNU/Linux synology_v1000_1821+


The relevant output from "make check" is

PASS: t-powm_ui
../../test-driver: line 107:  2851 Aborted                 (core dumped)
"$@" > $log_file 2>&1
FAIL: t-pow
PASS: t-div_2exp
../../test-driver: line 107:  2869 Aborted                 (core dumped)
"$@" > $log_file 2>&1
FAIL: t-root
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