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lib: Properly mark threads above 32 as available

This fixes the following MSVC warning:
../src/lib.c(460): warning C4334: '<<': result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)

--- a/src/lib.c

+++ b/src/lib.c

@@ -457,7 +457,7 @@

                 t->tile_thread.die = 1;

                 // mark not created tile threads as available

                 if (!t->tile_thread.td.inited)

-                    f->tile_thread.available |= 1<<m;

+                    f->tile_thread.available |= 1ULL<<m;

             }

             pthread_cond_broadcast(&f->tile_thread.cond);

             while (f->tile_thread.available != ~0ULL >> (64 - f->n_tc))