Packages: disabled debugsource generation on relevant platforms.

In particular, this fixes unit-go package building on Fedora >= 29.

pkg/rpm/unit.spec.in

@@ -67,6 +67,10 @@ dynamically via an API.
 %debug_package
 %endif
 
+%if 0%{?fedora}
+%define _debugsource_template %{nil}
+%endif
+
 %package devel
 Summary: NGINX Unit (development files)
 Version: %%VERSION%%
@@ -147,6 +151,13 @@ export QA_SKIP_BUILD_ROOT
 %if %{dotests}
 cd %{bdir} && make tests && ./build/tests
 %endif
+%{__rm} -rf %{buildroot}/usr/src
+cd %{bdir}
+grep -v 'usr/src' debugfiles.list > debugfiles.list.new && mv debugfiles.list.new debugfiles.list
+cat /dev/null > debugsources.list
+%if 0%{?suse_version} >= 1500
+cat /dev/null > debugsourcefiles.list
+%endif
 
 %clean
 %{__rm} -rf %{buildroot}