Makefile.in (TESTLIB): New.

* Makefile.in (TESTLIB): New.  This library is for future
testsuites.
(CFILES, REQUIRED_OFILES, CONFIGURED_OFILES): Re-alphabetize,
break down by letter.
(REQUIRED_OFILES): List long-to-compile files first.
(maint-deps): New, target for updating dependencies.
(dependencies): Update.
* maint-tool: Add dependency-generating option.
* configure.in: Check for _doprnt even if we're not providing it.
* configure: Regenerate.

* _doprnt.c: Modifications to allow compiling on any platform.
* copysign.c: Likewise.
* putenv.c: Likewise.
* setenv.c: Likewise.
* vsprintf.c: Likewise.

From-SVN: r49090