Improve compatibility with new CMake macro

Signed-off-by: Igor Raits <ignatenkobrain@fedoraproject.org>

plasma-desktop.spec

@@ -1,3 +1,4 @@
+%undefine __cmake_in_source_build
 
 %global kf5_version_min 5.69
 
@@ -215,17 +216,13 @@ sed -i.breeze_ver \
 %global optflags %(echo %{optflags} | sed 's/-g /-g1 /')
 %endif
 
-mkdir %{_target_platform}
+%{cmake_kf5} \
-pushd %{_target_platform}
-%{cmake_kf5} .. \
   %{?!synaptics:-DSynaptics_INCLUDE_DIRS:PATH="$(pwd)/../3rdparty/xorg"}
-popd
+%cmake_build
-
-%make_build -C %{_target_platform}
 
 
 %install
-make install/fast DESTDIR=%{buildroot} -C %{_target_platform}
+%cmake_install
 
 %find_lang %{name} --with-html --all-name