linux-info.eclass: add --no-print-directory to emake

Thanks to Jocelyn Mayer for the report and the patch.

When MAKEOPTS contains '-w' or '--print-directory',
getfilevar echoed value contains make: Entering directory
'xxx' and make: Leaving directory 'xxx' which result in
a wrong multiline version string thus making kernel
versions comparisons always fail.

Closes: https://bugs.gentoo.org/816888

Signed-off-by: Mike Pagano <mpagano@gentoo.org>

eclass/linux-info.eclass

@@ -208,7 +208,7 @@ getfilevar() {
 		# Pass dot-config=0 to avoid the config check in kernels prior to 5.4.
 		[[ ${EAPI:-0} == [0123] ]] && nonfatal() { "$@"; }
 		echo -e "e:\\n\\t@echo \$(${1})\\ninclude ${basefname}" | \
-			nonfatal emake -C "${basedname}" M="${T}" dot-config=0 need-config= ${BUILD_FIXES} -s -f - 2>/dev/null
+			nonfatal emake -C "${basedname}" --no-print-directory M="${T}" dot-config=0 need-config= ${BUILD_FIXES} -s -f - 2>/dev/null
 
 		ARCH=${myARCH}
 	fi