meson move to full python3 statements

Signed-off-by: basebuilder_pel7ppc64lebuilder0 <basebuilder@powerel.org>

SPECS/meson.spec

@@ -85,10 +85,10 @@ find -type f -name '*.py' -executable -exec sed -i -e '1s|.*|#!%{__python3}|' {}
 rm -rf "test cases/frameworks/17 mpi"
 
 %build
-%py3_build
+%{__python3} setup.py build
 
 %install
-%py3_install
+%{__python3} setup.py install --optimize 2 --root %{buildroot}
 install -Dpm0644 data/macros.%{name} %{buildroot}/usr/lib//rpm/macros.d/macros.%{name}
 
 %if %{with check}