Merge branch 'jk/pack-bitmap' into maint

The pack bitmap support did not build with older versions of GCC.

* jk/pack-bitmap:
ewah: fix building with gcc < 3.4.0

diff --combined ewah/ewok.h
index f6ad190a038a55e39a0b8b135c995413192f80e3,4b95847680fed3d534309b100fe00e3cdca5cb21..13c6e20412591ed3bc56b38b17419a540264f6c5
--- 1/ewah/ewok.h
--- 2/ewah/ewok.h
+++ b/ewah/ewok.h
@@@ -47,7 -47,8 +47,8 @@@ static inline uint32_t ewah_bit_popcoun
        return (x * 0x0101010101010101ULL) >> 56;
  }
  
- #ifdef __GNUC__
+ /* __builtin_ctzll was not available until 3.4.0 */
+ #if defined(__GNUC__) && (__GNUC__ > 3 || (__GNUC__ == 3  && __GNUC_MINOR > 3))
  #define ewah_bit_ctz64(x) __builtin_ctzll(x)
  #else
  static inline int ewah_bit_ctz64(uint64_t x)
@@@ -99,7 -100,8 +100,7 @@@ int ewah_serialize(struct ewah_bitmap *
  int ewah_serialize_native(struct ewah_bitmap *self, int fd);
  
  int ewah_deserialize(struct ewah_bitmap *self, int fd);
 -int ewah_read_mmap(struct ewah_bitmap *self, void *map, size_t len);
 -int ewah_read_mmap_native(struct ewah_bitmap *self, void *map, size_t len);
 +int ewah_read_mmap(struct ewah_bitmap *self, const void *map, size_t len);
  
  uint32_t ewah_checksum(struct ewah_bitmap *self);