Improve compatibility with new CMake macro

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

kf5-khtml.spec

@@ -1,3 +1,4 @@
+%undefine __cmake_in_source_build
 %global framework khtml
 
 Name:           kf5-%{framework}
@@ -72,17 +73,13 @@ developing applications that use %{name}.
 %autosetup -n %{framework}-%{version}
 
 %build
-mkdir %{_target_platform}
+%{cmake_kf5} \
-pushd %{_target_platform}
-%{cmake_kf5} .. \
   -DCMAKE_SHARED_LINKER_FLAGS="-Wl,--as-needed"
-popd
+%cmake_build
-
-make %{?_smp_mflags} -C %{_target_platform}
 
 
 %install
-make install/fast DESTDIR=%{buildroot} -C %{_target_platform}
+%cmake_install
 
 %find_lang khtml5_qt --with-qt --all-name