* 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/include/cygwin/signal.h

@@ -269,7 +269,11 @@ _sig_func_ptr sigset (int, _sig_func_ptr);
 
 int sigqueue(pid_t, int, const union sigval);
 int siginterrupt (int, int);
+#ifdef __INSIDE_CYGWIN__
+extern const char *sys_sigabbrev[];
+#else
 extern const char __declspec(dllimport) *sys_sigabbrev[];
+#endif
 
 #ifdef __cplusplus
 }