replace and remove _target_platform

bloom/generators/rpm/templates/meson/template.spec.em

@@ -46,26 +46,26 @@ if [ -f "@(InstallationPrefix)/setup.sh" ]; then . "@(InstallationPrefix)/setup.
     --cmake-prefix-path="@(InstallationPrefix)" \
     --libdir=lib \
     --libexecdir=lib \
-    %{_target_platform}
-%meson_build -C %{_target_platform}
+    %{_vpath_builddir}
+%meson_build
 
 %install
 # In case we're installing to a non-standard location, look for a setup.sh
 # in the install tree and source it.  It will set things like
 # CMAKE_PREFIX_PATH, PKG_CONFIG_PATH, and PYTHONPATH.
 if [ -f "@(InstallationPrefix)/setup.sh" ]; then . "@(InstallationPrefix)/setup.sh"; fi
-%meson_install -C %{_target_platform}
+%meson_install
 
 %if 0%{?with_tests}
 %check
 # Look for a Makefile target with a name indicating that it runs tests
-TEST_TARGET=$(%__ninja -C %{_target_platform} -t targets | sed "s/^\(test\|check\):.*/\\1/;t f;d;:f;q0")
+TEST_TARGET=$(%__ninja -C %{_vpath_builddir} -t targets | sed "s/^\(test\|check\):.*/\\1/;t f;d;:f;q0")
 if [ -n "$TEST_TARGET" ]; then
 # In case we're installing to a non-standard location, look for a setup.sh
 # in the install tree and source it.  It will set things like
 # CMAKE_PREFIX_PATH, PKG_CONFIG_PATH, and PYTHONPATH.
 if [ -f "@(InstallationPrefix)/setup.sh" ]; then . "@(InstallationPrefix)/setup.sh"; fi
-%meson_test -C %{_target_platform} || echo "RPM TESTS FAILED"
+%meson_test || echo "RPM TESTS FAILED"
 else echo "RPM TESTS SKIPPED"; fi
 %endif