Avoid gratitious use of %{_bindir}

This brakes module builds.

file-roller.spec

@@ -1,6 +1,6 @@
 Name:           file-roller
 Version:        3.30.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Tool for viewing and creating archives
 
 License:        GPLv2+
@@ -17,11 +17,11 @@ BuildRequires:  pkgconfig(json-glib-1.0) >= 0.14.0
 BuildRequires:  pkgconfig(libnotify) >= 0.4.3
 BuildRequires:  pkgconfig(libarchive) >= 3.0.0
 BuildRequires:  file-devel
-BuildRequires:  (%{_bindir}/gcpio or %{_bindir}/cpio)
+BuildRequires:  (/usr/bin/gcpio or /usr/bin/cpio)
 BuildRequires:  gettext
 BuildRequires:  itstool
-BuildRequires:  %{_bindir}/desktop-file-validate
-BuildRequires:  %{_bindir}/appstream-util
+BuildRequires:  /usr/bin/desktop-file-validate
+BuildRequires:  /usr/bin/appstream-util
 
 %description
 File Roller is an application for creating and viewing archives files,
@@ -70,6 +70,9 @@ desktop-file-validate %{buildroot}%{_datadir}/applications/org.gnome.FileRoller.
 %{_libdir}/nautilus/extensions-3.0/libnautilus-fileroller.so
 
 %changelog
+* Tue Oct  2 2018 Matthias Clasen <mclasen@redhat.com> - 3.30.1-2
+- Avoid gratitious use of %{_bindir}. This breaks module builds
+
 * Wed Sep 26 2018 Kalev Lember <klember@redhat.com> - 3.30.1-1
 - Update to 3.30.1