build: Add OpenMP reduction to support conda compiler

src/estarfm.cpp

@@ -200,6 +200,7 @@ estarfm_impl_detail::SumAndTolHelper::Stats estarfm_impl_detail::SumAndTolHelper
     unsigned int maskChannel = c < m_win.channels() ? c : 0;
     int xmax = h1_win.width();
     int ymax = h1_win.height();
+    #pragma omp declare reduction(+ : Stats : omp_out += omp_in)
     #pragma omp parallel for num_threads(opt.getNumberThreads()) reduction(+ : s)
     for (int y = 0; y < ymax; ++y) {
         for (int x = 0; x < xmax; ++x) {