Don't use lockdev for flatpak builds

lockdev style locking doesn't work in flatpaks because (1) /run/lock is
not shared with the host, and (2) systemd-tmpfiles isn't currently
available in our flatpak runtime so /run/lock/lockdev/ directory doesn't
get correctly set up.

While at this, also drop manual requires on lockdev as it's already
pulled in through autogenerated soname dependencies.

libgphoto2.spec

@@ -5,7 +5,7 @@
 
 Name:           libgphoto2
 Version:        2.5.27
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Library for accessing digital cameras
 # GPLV2+ for the main lib (due to exif.c) and most plugins, some plugins GPLv2
 License:        GPLv2+ and GPLv2
@@ -32,9 +32,10 @@ BuildRequires:  pkgconfig(libexif)
 # -----------------------------------
 # libgphoto2_port
 # -----------------------------------
+%if !0%{?flatpak}
 BuildRequires:  lockdev-devel
+%endif
 BuildRequires:  pkgconfig(libusb-1.0)
-Requires:       lockdev
 # -----------------------------------
 
 # Temporarily required for patch3
@@ -156,6 +157,9 @@ rm -rf %{buildroot}%{_datadir}/libgphoto2_port/*/vcamera/
 %{_mandir}/man3/%{name}_port.3*
 
 %changelog
+* Wed Oct 06 2021 Kalev Lember <klember@redhat.com> - 2.5.27-3
+- Don't use lockdev for flatpak builds
+
 * Thu Jul 22 2021 Fedora Release Engineering <releng@fedoraproject.org> - 2.5.27-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild