windows: Link gcc helpers statically on MinGW

Fixes #1049

Signed-off-by: Tormod Volden <debian.tormod@gmail.com>

configure.ac

diff --git a/configure.ac b/configure.ac
index 002bcf6..7dd7dd4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -124,6 +124,7 @@
 	platform=windows
 	test "x$enable_shared" = xyes && create_import_lib=yes
 	EXTRA_CFLAGS="-mwin32 -fno-omit-frame-pointer"
+	EXTRA_LDFLAGS="-static-libgcc"
 	;;
 *)
 	AC_MSG_RESULT([Null])
@@ -394,6 +395,8 @@
 
 AC_SUBST(LT_LDFLAGS)
 
+AC_SUBST([EXTRA_LDFLAGS])
+
 dnl set name of html output directory for doxygen
 AC_SUBST(DOXYGEN_HTMLDIR, [api-1.0])
 

libusb/Makefile.am

diff --git a/libusb/Makefile.am b/libusb/Makefile.am
index baf7b38..3475c9a 100644
--- a/libusb/Makefile.am
+++ b/libusb/Makefile.am
@@ -80,7 +80,7 @@
 endif
 endif
 
-libusb_1_0_la_LDFLAGS = $(LT_LDFLAGS)
+libusb_1_0_la_LDFLAGS = $(LT_LDFLAGS) $(EXTRA_LDFLAGS)
 libusb_1_0_la_SOURCES = libusbi.h version.h version_nano.h \
 	core.c descriptor.c hotplug.c io.c strerror.c sync.c \
 	$(PLATFORM_SRC) $(OS_SRC)

libusb/version_nano.h

diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index 888e511..6e2b30b 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11697
+#define LIBUSB_NANO 11698