Avoid setting the incremental flag when incremental is disabled

If incremental GC is disabled, `GC_incremental` is not a variable, but
instead is define, so it cannot be set.

1 files changed, 3 insertions, 1 deletions

diff --git a/misc.c b/misc.c
index 4662d394..dc2fbe81 100644
--- a/misc.c
+++ b/misc.c
@@ -2591,6 +2591,8 @@ GC_API void GC_CALL GC_disable_incremental(void)
 {
   LOCK();
   GC_gcollect_inner();
+#ifndef GC_DISABLE_INCREMENTAL
   GC_incremental = FALSE;
+#endif
   UNLOCK();
-}
\ No newline at end of file
+}