--with compat_build: Don't set %py_reproducible_pyc_path to unexisting path

    + /usr/lib/rpm/redhat/brp-fix-pyc-reproducibility /builddir/build/BUILDROOT/llvm19-19.1.3-4.fc40.x86_64/usr/lib/python3.12/site-packages
    find: ‘/builddir/build/BUILDROOT/llvm19-19.1.3-4.fc40.x86_64/usr/lib/python3.12/site-packages’: No such file or directory
    error: Bad exit status from /var/tmp/rpm-tmp.VbdRja (%install)

Author: hroncok

llvm.spec

@@ -371,7 +371,7 @@ BuildRequires: procps-ng
 # For reproducible pyc file generation
 # See https://docs.fedoraproject.org/en-US/packaging-guidelines/Python_Appendix/#_byte_compilation_reproducibility
 # Since Fedora 41 this happens automatically, and RHEL 8 does not support this.
-%if (%{defined fedora} && 0%{?fedora} < 41) || 0%{?rhel} == 9 || 0%{?rhel} == 10
+%if %{without compat_build} && ((%{defined fedora} && 0%{?fedora} < 41) || 0%{?rhel} == 9 || 0%{?rhel} == 10)
 BuildRequires: /usr/bin/marshalparser
 %global py_reproducible_pyc_path %{buildroot}%{python3_sitelib}
 %endif