[newlib-cygwin] Cygwin: configure: drop unused DEF_DLL_ENTRY variable

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=e0df580bf95702b94a9f4058ddb4d69c52b5ccac

commit e0df580bf95702b94a9f4058ddb4d69c52b5ccac
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Wed Jan 26 17:28:04 2022 +0100

    Cygwin: configure: drop unused DEF_DLL_ENTRY variable
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/configure.ac | 2 --
 1 file changed, 2 deletions(-)

diff --git a/winsup/configure.ac b/winsup/configure.ac
index e8b42de08..c0a43fc99 100644
--- a/winsup/configure.ac
+++ b/winsup/configure.ac
@@ -68,7 +68,6 @@ esac
 case "$target_cpu" in
    x86_64)
 		DLL_ENTRY="dll_entry"
-		DEF_DLL_ENTRY="dll_entry"
 		DIN_FILE="x86_64.din"
 		TLSOFFSETS_H="tlsoffsets64.h"
 		;;
@@ -76,7 +75,6 @@ case "$target_cpu" in
 esac
 
 AC_SUBST(DLL_ENTRY)
-AC_SUBST(DEF_DLL_ENTRY)
 AC_SUBST(DIN_FILE)
 AC_SUBST(TLSOFFSETS_H)