build-package.sh: make sure that termux_error_exit() is defined before throwing any errors

build-package.sh

@@ -3,6 +3,9 @@
 
 set -e -o pipefail -u
 
+# Utility function to log an error message and exit with an error code.
+source scripts/build/termux_error_exit.sh
+
 if [ "$(uname -o)" = Android ]; then
 	termux_error_exit "On-device builds are not supported - see README.md"
 fi
@@ -17,9 +20,6 @@ fi
 # lock file.
 : "${TERMUX_BUILD_IGNORE_LOCK:=false}"
 
-# Utility function to log an error message and exit with an error code.
-source scripts/build/termux_error_exit.sh
-
 # Utility function to download a resource with an expected checksum.
 source scripts/build/termux_download.sh