Drop optional gphoto2 build dependency

This is only being used for testing, undesired on RHEL/CentOS, and
already handled upstream. Unit tests are currently disabled during build
anyway.

Resolves: rhbz#1962633

umockdev.spec

@@ -1,6 +1,6 @@
 Name:             umockdev
 Version:          0.15.5
-Release:          1%{?dist}
+Release:          2%{?dist}
 Summary:          Mock hardware devices
 
 License:          LGPLv2+
@@ -15,8 +15,7 @@ BuildRequires:    glib2-devel
 BuildRequires:    libgudev1-devel systemd-devel
 BuildRequires:    vala
 BuildRequires:    chrpath
-# Required for tests
-BuildRequires:    gphoto2
+# Optional for more test coverage
 BuildRequires:    python3
 
 %description
@@ -77,6 +76,9 @@ rm -rf $RPM_BUILD_ROOT/%{_datadir}/doc/umockdev
 %{_datadir}/vala/vapi/umockdev-1.0.vapi
 
 %changelog
+* Thu May 20 2021 Martin Pitt <mpitt@redhat.com> - 0.15.5-2
+- Drop gphoto2 build dependency (rhbz#1962633)
+
 * Tue May 04 2021 Bastien Nocera <bnocera@redhat.com> - 0.15.5-1
 + umockdev-0.15.5-1
 - Update to 0.15.5