Avoid using deprecated meson options

... and drop jasper-devel BR as the support is gone in gdk-pixbuf 2.42.

gdk-pixbuf2.spec

@@ -2,7 +2,7 @@
 
 Name:           gdk-pixbuf2
 Version:        2.42.2
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        An image loading library
 
 License:        LGPLv2+
@@ -15,7 +15,6 @@ BuildRequires:  pkgconfig(gio-2.0) >= %{glib2_version}
 BuildRequires:  libpng-devel
 BuildRequires:  libjpeg-devel
 BuildRequires:  libtiff-devel
-BuildRequires:  jasper-devel
 BuildRequires:  meson
 BuildRequires:  pkgconfig(gobject-introspection-1.0) >= 0.9.3
 # gdk-pixbuf does a configure time check which uses the GIO mime
@@ -61,8 +60,9 @@ the functionality of the installed %{name} package.
 
 %build
 %meson -Dbuiltin_loaders=png \
-       -Ddocs=true \
-       -Djasper=true
+       -Dgtk_doc=true \
+       -Dman=true \
+       %{nil}
 
 %global _smp_mflags -j1
 %meson_build
@@ -117,6 +117,9 @@ gdk-pixbuf-query-loaders-%{__isa_bits} --update-cache
 %{_datadir}/installed-tests
 
 %changelog
+* Fri Feb 19 2021 Kalev Lember <klember@redhat.com> - 2.42.2-2
+- Avoid using deprecated meson options
+
 * Fri Feb 19 2021 Kalev Lember <klember@redhat.com> - 2.42.2-1
 - Update to 2.42.2
 - Split out gdk-pixbuf2-xlib to separate source package