Improve compatibility with new CMake macro

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

utf8cpp.spec

@@ -1,3 +1,4 @@
+%undefine __cmake_in_source_build
 # This package only contains header files.
 %global debug_package %{nil}
 
@@ -48,21 +49,16 @@ This project currently only contains header files, which can be found in the
 %patch0 -p1 -b .gtest
 %patch1 -p1 -b .noarch
 #%%patch10 -p1
-mkdir build
 
 %build
-pushd build
 %cmake3 \
    -DUTF8_TESTS=ON \
    -DUTF8_SAMPLES=ON \
-   ..
-%make_build
-popd
+   %{nil}
+%cmake3_build
 
 %install
-pushd build
-%make_install
-popd
+%cmake3_install
 pushd %{buildroot}%{_includedir}
 ln -s utf8cpp/utf8.h ./
 mkdir utf8
@@ -72,9 +68,7 @@ done
 popd
 
 %check
-pushd build
-%make_build test
-popd
+%ctest
 
 %files devel
 %doc README.md samples/docsample.cpp