Explicitly declare our build backend

This change more accurately reflects that ``setuptools`` is intended to use the ``build_meta`` backend from a previous installation. This may cause some problems with source builds if existing wheels for ``wheel`` and ``setuptools`` are not available. In that event, manually building a source wheel is recommended.
pypa · Feb 5, 2019 · 872d071 · 872d071
1 parent c1243e9
commit 872d071
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diff --git a/MANIFEST.in b/MANIFEST.in
@@ -12,4 +12,3 @@ include launcher.c
 include msvc-build-launcher.cmd
 include pytest.ini
 include tox.ini
-exclude pyproject.toml  # Temporary workaround for #1644.
diff --git a/pyproject.toml b/pyproject.toml
@@ -1,5 +1,6 @@
 [build-system]
-requires = ["wheel"]
+requires = ["setuptools", "wheel"]
+build-backend="setuptools.build_meta"
 
 [tool.towncrier]
     package = "setuptools"