+20150110
+ + add a step to generating ".map" files, to declare any remaining
+ symbols beginning with "_" as local, at the last version node.
+ + improve configure checks for pkg-config, addressing a variant found
+ with FreeBSD ports.
+ + modify win_driver.c to provide characters for special keys, like
+ ansi.sys, when keypad mode is off, rather than returning nothing at
+ all (discussion with Eli Zaretskii).
+ + add "broken_linker" and "hashed-db" configure options to combinations
+ use for generating the ".map" and ".sym" files.
+ + avoid using "ld" directly when creating shared library, to simplify
+ cross-compiles. Also drop "-Bsharable" option from shared-library
+ rules for FreeBSD and DragonFly (FreeBSD #196592).
+ + fix a memory leak in form library Free_RegularExpression_Type()
+ (report by Pavel Balaev).
+