* cygwin.din (sys_sigabbrev): Add this here.

* dcrt0.cc (__argc,__argv,_check_for_executable): Remove dllexport decoration
since it is already handled in cygwin.din.
* errno.cc (_sys_errlist): Ditto.
* strsig.cc (sys_sigabbrev): Ditto.
* include/cygwin/signal.h: Protect use of dllimport when __INSIDE_CYGWIN__.
* libc/getopt.c: Revert previous changes.  Define __INSIDE_CYGWIN__.

winsup/cygwin/errno.cc

@@ -143,7 +143,7 @@ static NO_COPY struct
 };
 
 extern "C" {
-const char __declspec(dllexport) * _sys_errlist[] NO_COPY_INIT =
+const char *_sys_errlist[] NO_COPY_INIT =
 {
 /* NOERROR 0 */		  "No error",
 /* EPERM 1 */		  "Operation not permitted",