Clarified build instructions for NumPy

Author: freakboy3742

Makefile

@@ -467,7 +467,7 @@ pip: Python-macOS
 	$(HOST_PYTHON) -m ensurepip
 
 # Create the directory that will contain installed packages
-dist/app_packages:
+dist/app_packages: pip
 	mkdir -p dist/app_packages
 
 # Makefiles for individual binary packages that are supported.

patch/numpy/README.rst

@@ -3,7 +3,11 @@ Adding NumPy to your iOS project
 
 1. Build NumPy. You can either build NumPy specficially::
 
-       make <name of package>
+       make numpy
+
+   or build NumPy for a specific platform::
+
+       make numpy-iOS
 
    or build all supported binary packages::