Check Windows build on CI and fix viewsvg compilation.

.github/workflows/main.yml

@@ -1,4 +1,4 @@
-name: Rust
+name: Build
 
 on: [push, pull_request]
 
@@ -46,3 +46,37 @@ jobs:
 
       - name: Build
         run: cargo build --features dump-svg
+
+  # We have some Windows specific code that we should check on each commit.
+  windows:
+    runs-on: windows-2019
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      # Toolchain is stable-x86_64-pc-windows-msvc by default. No need to change it.
+
+      - name: Build thumbnailer
+        working-directory: tools/explorer-thumbnailer
+        env:
+          RUSTFLAGS: -Ctarget-feature=+crt-static # make sure it's static
+        run: cargo build
+
+      - name: Install Qt
+        uses: jurplel/install-qt-action@v2
+        with:
+          version: '5.15.2'
+
+      # Unlike other binaries, viewsvg isn't built with crt-static
+      - name: Build C API
+        working-directory: c-api
+        run: cargo build --release
+
+      - name: Prepare Developer Command Prompt for MSVC
+        uses: ilammy/msvc-dev-cmd@v1
+
+      - name: Build viewsvg
+        working-directory: tools/viewsvg
+        run: |
+          qmake
+          nmake

.github/workflows/tagged-release.yml

@@ -130,7 +130,7 @@ jobs:
         with:
           version: '5.15.2'
 
-      # Unlike other binaries, viewsvg isn't build with crt-static
+      # Unlike other binaries, viewsvg isn't built with crt-static
       - name: Build C API
         working-directory: c-api
         run: cargo build --release

tools/viewsvg/viewsvg.pro

@@ -19,7 +19,7 @@ FORMS += \
 CONFIG(release, debug|release): LIBS += -L$$PWD/../../target/release/ -lresvg
 else:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../target/debug/ -lresvg
 
-windows:LIBS += -lWs2_32 -lAdvapi32 -lUserenv
+windows:LIBS += -lWs2_32 -lAdvapi32 -lBcrypt -lUserenv
 
 INCLUDEPATH += $$PWD/../../c-api
 DEPENDPATH += $$PWD/../../c-api