Added support for all mount-traversal flags in lfs3_format

I mean, why not? These redirect to the same internal lfs3_fs_gc_
function anyways. Might as well keep things consistent.

Added:

  LFS3_F_MKCONSISTENT  0x00000800  Make the filesystem consistent
  LFS3_F_RELOOKAHEAD   0x00001000  Repopulate lookahead buffer

LFS3_F_MKCONSISTENT is guaranteed to be a noop, but LFS3_F_RELOOKAHEAD
forces a filesystem traversal, which may have some niche use case.

No code changes.

lfs3.h

@@ -196,6 +196,14 @@ enum lfs3_type {
 #define LFS3_F_CKDATACKSUMS \
                         0x01000000  // Check data checksums on reads
 #endif
+#ifndef LFS3_RDONLY
+#define LFS3_F_MKCONSISTENT \
+                        0x00000800  // Make the filesystem consistent
+#endif
+#ifndef LFS3_RDONLY
+#define LFS3_F_RELOOKAHEAD \
+                        0x00001000  // Repopulate lookahead buffer
+#endif
 #if !defined(LFS3_RDONLY) && defined(LFS3_GBMAP)
 #define LFS3_F_REGBMAP  0x00002000  // Repopulate the gbmap
 #endif