add patch for handling requirements.txt that doesn't make it to SRC_DIR

recipes/pyserini/meta.yaml

@@ -7,6 +7,8 @@ package:
 source:
   url: https://pypi.io/packages/source/p/pyserini/pyserini-{{ version }}.tar.gz
   sha256: 4ff93e607f570f0643321cb073aa571ee298a7eec20b21c4e13812e16a75a65b
+  patches:
+    - patches/0001-remove-requirements.txt-handling-from-setup.py.patch
 
 build:
   # noarch: python
@@ -19,6 +21,7 @@ requirements:
   host:
     - python
     - pip
+    - setuptools
     - openjdk >=11
   run:
     - python

recipes/pyserini/patches/0001-remove-requirements.txt-handling-from-setup.py.patch

@@ -0,0 +1,35 @@
+From 4e82093ed5a4c1fcc63a97eb8523f6ef8162a4c0 Mon Sep 17 00:00:00 2001
+From: "H. Vetinari" <h.vetinari@gmx.com>
+Date: Fri, 9 Apr 2021 02:21:41 +0200
+Subject: [PATCH] remove requirements.txt handling from setup.py
+
+---
+ setup.py | 5 +----
+ 1 file changed, 1 insertion(+), 4 deletions(-)
+
+diff --git a/setup.py b/setup.py
+index 8eb4d96..4cfd93b 100644
+--- a/setup.py
++++ b/setup.py
+@@ -3,9 +3,6 @@ import setuptools
+ with open("project-description.md", "r") as fh:
+     long_description = fh.read()
+
+-with open('requirements.txt') as f:
+-    requirements = f.read().splitlines()
+-
+ setuptools.setup(
+     name="pyserini",
+     version="0.11.0.0",
+@@ -18,7 +15,7 @@ setuptools.setup(
+         "resources/jars/anserini-0.11.0-fatjar.jar",
+      ]},
+     url="https://github.com/castorini/pyserini",
+-    install_requires=requirements,
++    install_requires=[],
+     packages=setuptools.find_packages(),
+     classifiers=[
+         "Programming Language :: Python :: 3",
+-- 
+2.29.2.windows.3
+