adaptations for CMake out-of-tree builds

See: https://fedoraproject.org/wiki/Changes/CMake_to_do_out-of-source_builds

cmark.spec

@@ -50,23 +50,19 @@ This package provides the cmark library.
 
 
 %build
-mkdir build
+%cmake %{?_without_tests:-DCMARK_TESTS=OFF}
-cd build
+%cmake_build
-%cmake %{?_without_tests:-DCMARK_TESTS=OFF} ..
-make %{?_smp_mflags}
 
 
 %install
-cd build
+%cmake_install
-make install DESTDIR=%{buildroot}
 
 rm %{buildroot}%{_libdir}/libcmark.a
 
 
 %check
 %if %{with tests}
-cd build
+%cmake_build --target test
-make test
 %endif