Fixed CI Linux test failure #1953

Job	Run time
Default / build only	54s
Default / build only	54s
Default / pjmedia,pjnath	18m 30s
Default / pjmedia,pjnath	18m 30s
Default / pjlib,util,pjsip-test	31m 21s
Default / pjlib,util,pjsip-test	31m 21s
Default / pjsua-test	23m 43s
Default / pjsua-test	23m 43s
GnuTLS / pjlib,util,pjmedia,pjnath	32m 28s
GnuTLS / pjlib,util,pjmedia,pjnath	32m 28s
GnuTLS / pjsip-test	6h 0m 14s
GnuTLS / pjsip-test	18m 1s
OpenSSL / pjlib,util,pjnath,pjmedia	33m 10s
OpenSSL / pjlib,util,pjnath,pjmedia	33m 10s
OpenSSL / pjsip	18m 58s
OpenSSL / pjsip	18m 58s
FFMPEG+VPX+x264 / pjmedia	12m 43s
FFMPEG+VPX+x264 / pjmedia	12m 43s
Openh264+VPX / pjmedia,pjsua	28m 4s
Openh264+VPX / pjmedia,pjsua	28m 4s
Openh264+VPX / util,pjnath	21m 8s
Openh264+VPX / util,pjnath	21m 8s
Openh264+VPX / pjlib,pjsip	28m 31s
Openh264+VPX / pjlib,pjsip	28m 31s
VPX+VidToolbox / pjmedia	6m 46s
VPX+VidToolbox / pjmedia	6m 46s
	14h 50m 47s

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