Drop the unused BuildRequires on liboauth

The OAuth 1.0 support was made optional and disabled by default in
libgdata-0.17.11 [1] because it has been deprecated in Google APIs
since 2012, in favour of OAuth 2.0 or other more modern
authentication/authorisation methods. Therefore, the BuildRequires on
liboauth was unused.

Explicitly disable the OAuth 1.0 feature in the build to drive home
the point.

[1] https://gitlab.gnome.org/GNOME/libgdata/-/issues/1
    https://gitlab.gnome.org/GNOME/libgdata/-/merge_requests/18

Resolves: #1996380

libgdata.spec

@@ -1,6 +1,6 @@
 Name:           libgdata
 Version:        0.18.1
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Library for the GData protocol
 
 License:        LGPLv2+
@@ -17,7 +17,6 @@ BuildRequires:  gtk-doc
 BuildRequires:  uhttpmock-devel
 %endif
 BuildRequires:  json-glib-devel
-BuildRequires:  liboauth-devel
 BuildRequires:  libsoup-devel
 BuildRequires:  libxml2-devel
 BuildRequires:  meson
@@ -53,6 +52,7 @@ export CFLAGS="$RPM_OPT_FLAGS -fno-strict-aliasing"
 %endif
   -Dinstalled_tests=false \
   -Dgtk_doc=true \
+  -Doauth1=disabled \
   %{nil}
 %meson_build
 
@@ -88,6 +88,10 @@ export CFLAGS="$RPM_OPT_FLAGS -fno-strict-aliasing"
 %{_datadir}/vala/
 
 %changelog
+* Sun Aug 22 2021 Debarshi Ray <rishi@fedoraproject.org> - 0.18.1-4
+- Drop the unused BuildRequires on liboauth
+Resolves: #1996380
+
 * Mon Aug 09 2021 Mohan Boddu <mboddu@redhat.com> - 0.18.1-3
 - Rebuilt for IMA sigs, glibc 2.34, aarch64 flags
   Related: rhbz#1991688