Add patch for hidapi + autoconf 2.70+

Fixes the mac build, and will fix future linux build once distros start
shipping 2.70+.

cmake/StaticBuild.cmake

@@ -519,6 +519,7 @@ else()
   endif()
   build_external(hidapi
     DEPENDS ${maybe_eudev} libusb_external
+    PATCH_COMMAND patch -p1 -i ${PROJECT_SOURCE_DIR}/utils/build_scripts/hidapi-autoconf-duplicate-macro-dir.patch
     CONFIGURE_COMMAND autoreconf -ivf && ./configure ${cross_host} --prefix=${DEPS_DESTDIR} --disable-shared --enable-static --with-pic
       "CC=${deps_cc}" "CXX=${deps_cxx}" "CFLAGS=${deps_CFLAGS}" "CXXFLAGS=${deps_CXXFLAGS}"
       ${cross_extra}

utils/build_scripts/hidapi-autoconf-duplicate-macro-dir.patch

@@ -0,0 +1,22 @@
+From 363461494702dfd8f37943f670dd7315c4f4e364 Mon Sep 17 00:00:00 2001
+From: Jan Palus <atler@pld-linux.org>
+Date: Fri, 25 Dec 2020 13:51:30 +0100
+Subject: [PATCH] configure.ac: remove duplicate AC_CONFIG_MACRO_DIR
+
+fixes build with autoconf 2.70
+---
+ configure.ac | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index 220909a0..77da67af 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -13,7 +13,6 @@ LTLDFLAGS="-version-info ${lt_current}:${lt_revision}:${lt_age}"
+ 
+ AC_CONFIG_MACRO_DIR([m4])
+ AM_INIT_AUTOMAKE([foreign -Wall -Werror])
+-AC_CONFIG_MACRO_DIR([m4])
+ 
+ m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
+ LT_INIT