prelude: Rely more on __has_include()

Rather than a bunch of manual fallback macros, just provide a fallback
definition that returns false.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/bit.h b/src/bit.h
index c494130..7546aba 100644
--- a/src/bit.h
+++ b/src/bit.h
@@ -12,7 +12,7 @@
 #include <limits.h>
 #include <stdint.h>
 
-#if BFS_HAS_STDBIT_H
+#if __has_include(<stdbit.h>)
 #  include <stdbit.h>
 #endif