Merge branch 'nd/wildmatch'

Allows pathname patterns in .gitignore and .gitattributes files
with double-asterisks "foo/**/bar" to match any number of directory
hierarchies.

* nd/wildmatch:
  wildmatch: replace variable 'special' with better named ones
  compat/fnmatch: respect NO_FNMATCH* even on glibc
  wildmatch: fix "**" special case
  t3070: Disable some failing fnmatch tests
  test-wildmatch: avoid Windows path mangling
  Support "**" wildcard in .gitignore and .gitattributes
  wildmatch: make /**/ match zero or more directories
  wildmatch: adjust "**" behavior
  wildmatch: fix case-insensitive matching
  wildmatch: remove static variable force_lower_case
  wildmatch: make wildmatch's return value compatible with fnmatch
  t3070: disable unreliable fnmatch tests
  Integrate wildmatch to git
  wildmatch: follow Git's coding convention
  wildmatch: remove unnecessary functions
  Import wildmatch from rsync
  ctype: support iscntrl, ispunct, isxdigit and isprint
  ctype: make sane_ctype[] const array

Conflicts:
	Makefile

Documentation/gitignore.txt

@@ -108,6 +108,25 @@ PATTERN FORMAT
    For example, "/{asterisk}.c" matches "cat-file.c" but not
    "mozilla-sha1/sha1.c".
 
+Two consecutive asterisks ("`**`") in patterns matched against
+full pathname may have special meaning:
+
+ - A leading "`**`" followed by a slash means match in all
+   directories. For example, "`**/foo`" matches file or directory
+   "`foo`" anywhere, the same as pattern "`foo`". "**/foo/bar"
+   matches file or directory "`bar`" anywhere that is directly
+   under directory "`foo`".
+
+ - A trailing "/**" matches everything inside. For example,
+   "abc/**" matches all files inside directory "abc", relative
+   to the location of the `.gitignore` file, with infinite depth.
+
+ - A slash followed by two consecutive asterisks then a slash
+   matches zero or more directories. For example, "`a/**/b`"
+   matches "`a/b`", "`a/x/b`", "`a/x/y/b`" and so on.
+
+ - Other consecutive asterisks are considered invalid.
+
 NOTES
 -----