build-package: mv termux_error_exit to scripts/build/

build-package.sh

@@ -4,14 +4,7 @@
 set -e -o pipefail -u
 
 # Utility function to log an error message and exit with an error code.
-termux_error_exit() {
-	echo "ERROR: $*" 1>&2
-	exit 1
-}
-
-if [ "$(uname -o)" = Android ]; then
-	termux_error_exit "On-device builds are not supported - see README.md"
-fi
+source scripts/build/termux_error_exit.sh
 
 # Utility function to download a resource with an expected checksum.
 termux_download() {

scripts/build/termux_error_exit.sh

@@ -0,0 +1,8 @@
+termux_error_exit() {
+	echo "ERROR: $*" 1>&2
+	exit 1
+}
+
+if [ "$(uname -o)" = Android ]; then
+	termux_error_exit "On-device builds are not supported - see README.md"
+fi