Do not run tests on ARMv7 when no KVM is available - TCG is going to fail anyway

Makefile

@@ -20,9 +20,10 @@ all:
 	$(MAKE) -C libguestfs-1.42.0
 
 # As of November 2020 QEMU 5.1.0 does not have functioning TCG implementation of Skylake CPU - attempt to run libguestfs tests in TCG mode bound to fail on Skylake system.
+# As of April 2021 QEMU 5.1.0 does not have functioning TCG implementation of Cortex-A7 CPU running on ARMv7 - attempt to run libguestfs tests in TCG mode bound to fail on ARMv7 system.
 # Let's skip testing (with heavy heart) hoping that whatever bugs lurking around will become apparent during builds for other types of CPUs.
-# This condition should be removed in the future when QEMU TCG will catch up with real world Skylake CPU.
-	if [[ `lscpu | grep -c "^Model name:.*Skylake"` = 0 ]] ; then \
+# This condition should be removed/modified in the future when QEMU TCG will catch up with real world Skylake CPU and/or Cortex-A7.
+	if [[ `lscpu | grep -c "^Model name:.*Skylake"` = 0 ]] && ! [[ ! -c /dev/kvm && `uname -m` = 'armv7l' ]] ; then \
 	    chown -Rv nobody libguestfs-1.42.0 ; \
 	    su nobody -s /bin/bash -c "PATH=$$PATH SKIP_QEMU_FORCE_TCG_SH=1 make -C libguestfs-1.42.0 check" ; \
 	fi