CI: Add MinGW build on MSYS2 (Windows)

Closes #1102

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

.github/workflows/msys2.yml

diff --git a/.github/workflows/msys2.yml b/.github/workflows/msys2.yml
new file mode 100644
index 0000000..116ad18
--- /dev/null
+++ b/.github/workflows/msys2.yml
@@ -0,0 +1,21 @@
+name: MSYS2 build
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: msys2/setup-msys2@v2
+        with:
+          msystem: MINGW64
+          update: true
+          install: git mingw-w64-x86_64-cc mingw-w64-x86_64-autotools
+      - name: CI-Build
+        run: |
+          echo 'Running in MSYS2!'
+          ./bootstrap.sh
+          ./.private/ci-build.sh --build-dir build-msys2

libusb/version_nano.h

diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index 46b5e01..1de3b3b 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11717
+#define LIBUSB_NANO 11718