Apply suggestions from code review

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/math/base/special/pow/src/Makefile

@@ -67,4 +67,4 @@ clean-addon:
 #/
 clean: clean-addon
 
-.PHONY: clean
+.PHONY: clean