Revert "make.sh: Fix build with kernels < 6.0.0"

This reverts commit 8ea702f3f8.

This commit seems to introduce many more regressions when building
packages which I cannot easily reproduce.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

make.sh

@@ -47,7 +47,6 @@ KVER="${KVER/-rc/.0-rc}${KVER_SUFFIX}"
 ###############################################################################
 
 HOST_ARCH="${HOSTTYPE}"
-HOST_KERNEL="$(uname -r)"
 LC_ALL=POSIX
 PS1='\u:\w$ '
 
@@ -296,76 +295,6 @@ __timer_event() {
 	return 0
 }
 
-version_compare() {
-	local v1="${1}"
-	local op="${2}"
-	local v2="${3}"
-
-	# Split both versions by .
-	v1=( ${v1//./ } )
-	v2=( ${v2//./ } )
-
-	# Run for as long as both versions have not been fully processed
-	while [ "${#v1[@]}" -gt 0 ] && [ "${#v2[@]}" -gt 0 ]; do
-		# Fetch the first element from each version
-		local f1="${v1[@]:0:1}"
-		local f2="${v2[@]:0:1}"
-
-		# Shift the array
-		v1=( ${v1[@]:1} )
-		v2=( ${v2[@]:1} )
-
-		local n1
-		local n2
-
-		# Split off any numeric parts
-		if [[ ${f1} =~ ^([0-9]+) ]]; then
-			n1="${BASH_REMATCH[1]}"
-		fi
-
-		if [[ ${f2} =~ ^([0-9]+) ]]; then
-			n2="${BASH_REMATCH[1]}"
-		fi
-
-		# Remove the numeric parts from each field
-		f1="${f1#${n1}}"
-		f2="${f2#${n2}}"
-
-		# Check the numeric parts first
-		if [ -n "${n1}" ] && [ -n "${n2}" ]; then
-			case "${op}" in
-				ge)
-					if [ "${n1}" -ge "${n2}" ]; then
-						return 1
-					fi
-					;;
-			esac
-
-		# If we only have a numeric part in the first version...
-		elif [ -n "${n1}" ]; then
-			case "${op}" in
-				ge)
-					return 1
-					;;
-			esac
-
-		# If we only have a numeric part in the second version...
-		elif [ -n "${n2}" ]; then
-			case "${op}" in
-				ge)
-					return 0
-					;;
-			esac
-		fi
-
-		# I don't know how to handle the non-numeric part here, and we should not need it
-		# as we are only using this for kernel versions which should all lead with numbers.
-	done
-
-	# Don't know
-	return 0
-}
-
 exiterror() {
 	# Dump logfile
 	if [ -n "${LOGFILE}" ] && [ -e "${LOGFILE}" ]; then
@@ -739,19 +668,13 @@ execute() {
 			# Create a new UTS namespace
 			"--uts"
 
+			# Mount /proc so that the build environment does not see
+			# any foreign processes.
+			"--mount-proc=${BUILD_DIR}/proc"
+
 			# If unshare is asked to terminate, terminate all child processes
 			"--kill-child"
 		)
-
-		# Mount /proc so that the build environment does not see
-		# any foreign processes.
-		# This does not work on kernels < 6.0.0, and we will mount /proc
-		# in the execute.sh script instead.
-		if version_compare "${HOST_KERNEL}" ge "6.0.0"; then
-			unshare+=(
-				"--mount-proc=${BUILD_DIR}/proc"
-			)
-		fi
 	fi
 
 	while [ $# -gt 0 ]; do

tools/execute.sh

@@ -22,11 +22,6 @@
 # This is a helper script that is called after we have created the new
 # namespaces to perform further setup. This will be executed on the host.
 
-# Mount /proc if it has not been mounted, yet
-if ! mountpoint /proc; then
-	mount -t procfs none /proc -o nosuid,noexec,nodev
-fi
-
 # Bring up the loopback interface
 ip link set lo up &>/dev/null