Merge branch 'ml/cygwin-updates'

The tip one does _not_ revert c869753 (Force core.filemode to
false on Cygwin., 2006-12-30) on purpose, so that people can
still retain the old behaviour if they wanted to.

* ml/cygwin-updates:
  cygwin: stop forcing core.filemode=false
  Cygwin 1.7 supports mmap
  Cygwin 1.7 has thread-safe pread
  Cygwin 1.7 needs compat/regex

Author: gitster

config.mak.uname

@@ -159,16 +159,17 @@ ifeq ($(uname_O),Cygwin)
 		NO_SYMLINK_HEAD = YesPlease
 		NO_IPV6 = YesPlease
 		OLD_ICONV = UnfortunatelyYes
+		NO_THREAD_SAFE_PREAD = YesPlease
+		# There are conflicting reports about this.
+		# On some boxes NO_MMAP is needed, and not so elsewhere.
+		# Try commenting this out if you suspect MMAP is more efficient
+		NO_MMAP = YesPlease
+	else
+		NO_REGEX = UnfortunatelyYes
 	endif
-	NO_THREAD_SAFE_PREAD = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	NO_FAST_WORKING_DIRECTORY = UnfortunatelyYes
-	NO_TRUSTABLE_FILEMODE = UnfortunatelyYes
 	NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
-	# There are conflicting reports about this.
-	# On some boxes NO_MMAP is needed, and not so elsewhere.
-	# Try commenting this out if you suspect MMAP is more efficient
-	NO_MMAP = YesPlease
 	X = .exe
 	COMPAT_OBJS += compat/cygwin.o
 	UNRELIABLE_FSTAT = UnfortunatelyYes