dev-python/nltk: Fix python_requires in metadata

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/nltk/files/nltk-3.6.2-metadata.patch

@@ -0,0 +1,38 @@
+From f8d834d9ac1e5b26f04cebd8ca6f07ed15935e70 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
+Date: Sat, 29 May 2021 18:32:53 +0200
+Subject: [PATCH] setup.py: fix python_requires
+
+Fix python_requires to specify a valid version.  Apparently, combining
+>= and .* is disallowed, and I'm pretty sure 'just' >=3.5 means
+the same.
+
+To reproduce the problem, you can:
+
+    $ pip install nltk distlib
+    $ python -c "import distlib.database; \
+      distlib.database.DistributionPath().get_distribution('nltk')"
+
+which yields a (not very readable) error of:
+
+    ValueError: '.*' not allowed for '>=' constraints
+---
+ setup.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/setup.py b/setup.py
+index 49dc08098..7be160494 100644
+--- a/setup.py
++++ b/setup.py
+@@ -108,7 +108,7 @@ natural language processing.  NLTK requires Python 3.5, 3.6, 3.7, 3.8, or 3.9.""
+         "Topic :: Text Processing :: Linguistic",
+     ],
+     package_data={"nltk": ["test/*.doctest", "VERSION"]},
+-    python_requires='>=3.5.*',
++    python_requires='>=3.5',
+     install_requires=[
+         "click",
+         "joblib",
+-- 
+2.31.1
+

dev-python/nltk/nltk-3.6.2-r1.ebuild

@@ -39,6 +39,10 @@ PDEPEND="dev-python/nltk-data"
 
 distutils_enable_tests pytest
 
+PATCHES=(
+	"${FILESDIR}"/${P}-metadata.patch
+)
+
 src_prepare() {
 	# requires unpackaged pycrfsuite
 	sed -i -e '/>>>/s@$@ # doctest: +SKIP@' nltk/tag/crf.py || die