Fix handling of shebangs

- Use new _py3_shebang_s macro
- Allow %pyproject_install to handle shebang fixing where appropriate

ansible-core.spec

@@ -108,8 +108,16 @@ This package includes shell completions files for ansible-core.
 %prep
 %autosetup -p1 -n ansible-%{version}
 find \( -name '.git_keep' -o -name '.rstcheck.cfg' \) -delete
-sed -i -s 's|/usr/bin/env python|%{python3}|' test/lib/ansible_test/_util/target/cli/ansible_test_cli_stub.py bin/*
-sed -i -e '1{\@^#!.*@d}' lib/ansible/cli/*.py lib/ansible/modules/hostname.py lib/ansible/cli/scripts/ansible_connection_cli_stub.py
+
+# ansible-test is executed directly by the Makefile, so we need to fix the shebang.
+sed -i -s 's|/usr/bin/env python|%{python3}|' \
+    bin/ansible-test \
+    test/lib/ansible_test/_util/target/cli/ansible_test_cli_stub.py
+
+
+# TODO: Investigate why hostname is the only module that still has a shebang
+# and file an upstream issue if needed.
+sed -i -e '1{\@^#!.*@d}' lib/ansible/modules/hostname.py
 
 %generate_buildrequires
 temp=$(mktemp)
@@ -118,11 +126,7 @@ sed '/^mock$/d' test/lib/ansible_test/_data/requirements/units.txt > ${temp}
 
 %build
 # disable the python -s shbang flag as we want to be able to find non system modules
-%global py3_shebang_flags %(echo %{py3_shebang_flags} | sed 's/s//')
-%py3_shebang_fix .
-
-# Build manpages
-make PYTHON=%{python3} docs
+%undefine _py3_shebang_s
 
 %pyproject_wheel