Win32: we don't need libstdc++-6.dll or libwinpthread-1.dll

libgcc_s is still needed, for C++ modules

Gotta love libtool

Ref #12620

(cherry picked from commit 5d78deeb986e4bf77140dfbad63b0f0b14b98a53)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

extras/package/win32/package.mak

@@ -65,11 +65,8 @@ endif
 	IFS=':' ;\
 	for x in $$library_path_list ;\
 	do \
-		test -f "$$x/libstdc++-6.dll" && cp "$$x/libstdc++-6.dll" "$(win32_destdir)/" ; \
 		test -f "$$x/libgcc_s_sjlj-1.dll" && cp "$$x/libgcc_s_sjlj-1.dll" "$(win32_destdir)/" ; \
 		test -f "$$x/libgcc_s_seh-1.dll" && cp "$$x/libgcc_s_seh-1.dll" "$(win32_destdir)/" ; \
-		test -f "$$x/libwinpthread-1.dll" && cp "$$x/libwinpthread-1.dll" "$(win32_destdir)/" ; \
-		test -f "$$x/../bin/libwinpthread-1.dll" && cp "$$x/../bin/libwinpthread-1.dll" "$(win32_destdir)/" ; \
 	done
 
 # SDK