Cygwin: Don't increment DLL reference count in dladdr.

Unlike GetModuleHandle, GetModuleHandleEx increments the reference count
by default unless the GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT flag
is passed.

Fixes: c8432a0 ("Implement dladdr() (partially)")
Addresses: https://cygwin.com/pipermail/cygwin/2025-April/257864.html
Signed-off-by: Jeremy Drake <[email protected]>
(cherry picked from commit 97f9ef3)

Author: jeremyd2019

winsup/cygwin/dlfcn.cc

@@ -408,7 +408,8 @@ extern "C" int
 dladdr (const void *addr, Dl_info *info)
 {
   HMODULE hModule;
-  BOOL ret = GetModuleHandleEx (GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
+  BOOL ret = GetModuleHandleEx (GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT|
+				GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
 				(LPCSTR) addr,
 				&hModule);
   if (!ret)

winsup/cygwin/release/3.6.1

@@ -36,3 +36,6 @@ Fixes:
   subprocess failure in cmake (>= 3.29.x).
   Addresses: https://cygwin.com/pipermail/cygwin/2025-March/257800.html
   Addresses: https://github.com/msys2/msys2-runtime/issues/272
+
+- Don't increment DLL reference count in dladdr.
+  Addresses: https://cygwin.com/pipermail/cygwin/2025-April/257862.html