* configure.in: Add AC_EXEEXT.

* configure: Regenerate.
	* Makefile.in (just-check): Export EXEEXT.
	* lib/gdb.exp ($EXEEXT): Import from environment.
	* gdb.base/maint.exp: Expect $EXEEXT in executable name.  Don't
	expect "maint dump-me" on Cygwin.
	* gdb.base/reread.exp ($binfile, $binfile1, $binfile2): Append
	$EXEEXT.

gdb/testsuite/lib/gdb.exp

@@ -63,6 +63,16 @@ if ![info exists gdb_prompt] then {
     set gdb_prompt "\[(\]gdb\[)\]"
 }
 
+# Needed for some tests under Cygwin.
+global EXEEXT
+global env
+
+if ![info exists env(EXEEXT)] {
+    set EXEEXT ""
+} else {
+    set EXEEXT $env(EXEEXT)
+}
+
 ### Only procedures should come after this point.
 
 #