use %autosetup

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

libxml2.spec

@@ -7,6 +7,7 @@ License:        MIT
 URL:            http://xmlsoft.org/
 Source:         ftp://xmlsoft.org/libxml2/libxml2-%{version}.tar.gz
 Patch0:         libxml2-multilib.patch
+# workaround for #877567 - Very weird bug gzip decompression bug in "recent" libxml2 versions
 Patch1:         libxml2-2.9.0-do-not-check-crc.patch
 # In python3.6 _PyVerify_fd is no more
 #  http://bugs.python.org/issue23524
@@ -90,11 +91,7 @@ this includes parsing and validation even with complex DTDs, either
 at parse time or later once the document has been modified.
 
 %prep
-%setup -q
-%patch0 -p1
-# workaround for #877567 - Very weird bug gzip decompression bug in "recent" libxml2 versions
-%patch1 -p1 -b .do-not-check-crc
-%patch2 -p1
+%autosetup -p1
 
 mkdir py3doc
 cp doc/*.py py3doc