move chmod to %prep

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

libxml2.spec

@@ -91,10 +91,7 @@ at parse time or later once the document has been modified.
 
 %prep
 %autosetup -p1
-
-mkdir py3doc
-cp doc/*.py py3doc
-sed -i 's|#!/usr/bin/python |#!%{__python3} |' py3doc/*.py
+find doc -type f -executable -print -exec chmod 0644 {} ';'
 
 %build
 mkdir py2 py3
@@ -104,8 +101,6 @@ mkdir py2 py3
 %make_build -C py2
 %make_build -C py3
 
-find doc -type f -exec chmod 0644 \{\} \;
-
 %install
 rm -fr %{buildroot}