Configure debug info to DWARF v4. #360

Job	Run time
ubuntu-20.04, gcc 7-2017-q4, cmake 3.6.0	1m 19s
ubuntu-20.04, gcc 7-2017-q4, cmake latest	1m 34s
ubuntu-20.04, gcc latest, cmake 3.6.0	1m 10s
ubuntu-20.04, gcc latest, cmake latest	1m 11s
macos-11, gcc 7-2017-q4, cmake 3.6.0	1m 47s
macos-11, gcc 7-2017-q4, cmake latest	2m 7s
macos-11, gcc latest, cmake 3.6.0	2m 5s
macos-11, gcc latest, cmake latest	2m 3s
windows-2019, gcc 7-2017-q4, cmake 3.6.0	2m 37s
windows-2019, gcc 7-2017-q4, cmake latest	2m 57s
windows-2019, gcc latest, cmake 3.6.0	3m 16s
windows-2019, gcc latest, cmake latest	4m 31s
	26m 37s

Provide feedback