fix path issue when installing scripts

Author: Leonid Pliushch

Makefile

@@ -7,7 +7,7 @@ install: termux-api
 	mkdir -p $(PREFIX)/bin/ $(PREFIX)/libexec/
 	install termux-api $(PREFIX)/libexec/
 	install termux-callback $(PREFIX)/libexec/
-	for i in scripts/*; do \
+	cd scripts; for i in *; do \
 	  sed -e "s|@TERMUX_PREFIX@|$(PREFIX)|g" $$i > $(PREFIX)/bin/$$i; \
 	  chmod 700 $(PREFIX)/bin/$$i; \
 	done