win32: Unbreak packaging with recent compilers

Signed-off-by: Rafaël Carré <funman@videolan.org>
(cherry picked from commit acb92632bda62d13629f15985bfe9f686ae162dc)
Signed-off-by: Rafaël Carré <funman@videolan.org>

extras/package/win32/package.mak

@@ -70,6 +70,7 @@ endif
 	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