Improve compatibility with new CMake macro

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

kf5-kpty.spec

@@ -1,3 +1,4 @@
+%undefine __cmake_in_source_build
 %global framework kpty
 
 Name:           kf5-%{framework}
@@ -44,19 +45,15 @@ developing applications that use %{name}.
 
 
 %build
-mkdir %{_target_platform}
-pushd %{_target_platform}
 # find_program for utempter is failing for some reason, so
 # set path explicitly to known-good value
-%{cmake_kf5} .. \
+%{cmake_kf5} \
   -DUTEMPTER_EXECUTABLE:PATH=/usr/libexec/utempter/utempter
-popd
+%cmake_build
-
-%make_build -C %{_target_platform}
 
 
 %install
-make install/fast DESTDIR=%{buildroot} -C %{_target_platform}
+%cmake_install
 
 %find_lang %{name} --all-name --with-man