test

Fix gcc line in Makefile for Linux #6841

Job	Run time
Windows tests	4m 37s
Lints	1m 52s
Colima tests (QEMU, Linux host) (v0.6.5)	14m 38s
Integration tests (QEMU, macOS host)	9m 34s
Integration tests (QEMU, Linux host) (alpine.yaml)	5m 59s
Integration tests (QEMU, Linux host) (debian.yaml)	6m 32s
Spell check	8s
Unit tests (1.22.x)	47s
Unit tests (1.23.x)	4m 9s
Integration tests (QEMU, Linux host) (fedora.yaml)	6m 28s
Upgrade tests (QEMU, macOS host) (v0.15.1)	8m 52s
Integration tests (QEMU, Linux host) (archlinux.yaml)	7m 56s
Integration tests (QEMU, Linux host) (opensuse.yaml)	9m 21s
VMNet tests (QEMU)	7m 49s
Integration tests (QEMU, Linux host) (docker.yaml)	7m 17s
Integration tests (vz) (default.yaml, true)	8m 11s
Integration tests (QEMU, Linux host) (../hack/test-templates/alpine-iso-9p-writable.yaml)	5m 37s
Integration tests (vz) (fedora.yaml, false)	9m 13s
Integration tests (QEMU, Linux host) (../hack/test-templates/net-user-v2.yaml)	6m 48s
Integration tests (QEMU, Linux host) (../hack/test-templates/test-misc.yaml)	19m 12s
	2h 25m 0s

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