Join omp pragmas

in d5p2.

day5/p2.c

@@ -83,8 +83,7 @@ int main(int argc, char **argv) {
     uint64_t lowest_loc_n = UINT64_MAX;
 
     for (size_t i = 0; i < seed_ranges_len; i += 2) {
-        #pragma omp shared(lowest_loc_n)
-        #pragma omp parallel for
+        #pragma omp parallel for shared(lowest_loc_n)
         for (uint64_t r = seed_ranges[i]; r < seed_ranges[i] + seed_ranges[i+1]; ++r) {
             uint64_t seed = r;