Use cbindgen included in GitHub Actions runners

Building cbindgen takes a few minutes on Windows, so avoid that by using
the version included in the GitHub Actions runner.

The version include in the runners isn't the same as what the build
expects, but hopefully the differences aren't significant.

.github/workflows/ci.yml

@@ -9,7 +9,6 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
-  CBINDGEN_VERSION: 0.13.2
   MSVC_CONFIG: RelWithDebInfo
 
 jobs:
@@ -40,12 +39,6 @@ jobs:
             ~/.cargo/git
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
-      - name: Install cbindgen
-        run: |
-          wget -P "$HOME/.local/bin" https://github.com/eqrion/cbindgen/releases/download/v0.13.2/cbindgen
-          chmod +x "$HOME/.local/bin/cbindgen"
-          echo "$HOME/.local/bin" >> $GITHUB_PATH
-
       - name: Get descriptive libloot version
         id: get-libloot-version
         shell: bash
@@ -86,7 +79,10 @@ jobs:
           ./libloot_tests
 
       - name: Install packages for building docs
-        run: pip3 install --user -r docs/requirements.txt
+        shell: bash
+        run: |
+          pip3 install --user -r docs/requirements.txt
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
 
       - name: Build docs
         run: sphinx-build -b html docs build/docs/html
@@ -129,22 +125,9 @@ jobs:
             ~/.cargo/git
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
-      - name: Cache cbindgen
-        id: cache-cbindgen
-        uses: actions/cache@v2
-        with:
-          path: ~/.cargo/bin/cbindgen.exe
-          key: ${{ runner.os }}-cbindgen-${{ env.CBINDGEN_VERSION }}
-
       - name: Install Rust i686-pc-windows-msvc target
         run: rustup target add i686-pc-windows-msvc
 
-      - name: Install cbindgen
-        run: |
-          cargo install cbindgen --version ${{ env.CBINDGEN_VERSION }}
-          echo "~/.cargo/bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
-        if: steps.cache-cbindgen.outputs.cache-hit != 'true'
-
       - name: Get descriptive libloot version
         id: get-libloot-version
         shell: bash

.github/workflows/release.yml

@@ -6,7 +6,6 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
-  CBINDGEN_VERSION: 0.13.2
   MSVC_CONFIG: RelWithDebInfo
 
 jobs:
@@ -55,12 +54,6 @@ jobs:
             ~/.cargo/git
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
-      - name: Install cbindgen
-        run: |
-          wget -P "$HOME/.local/bin" https://github.com/eqrion/cbindgen/releases/download/v0.13.2/cbindgen
-          chmod +x "$HOME/.local/bin/cbindgen"
-          echo "$HOME/.local/bin" >> $GITHUB_PATH
-
       - name: Get descriptive libloot version
         id: get-libloot-version
         shell: bash
@@ -148,22 +141,9 @@ jobs:
             target
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
-      - name: Cache cbindgen
-        id: cache-cbindgen
-        uses: actions/cache@v2
-        with:
-          path: ~/.cargo/bin/cbindgen.exe
-          key: ${{ runner.os }}-cbindgen-${{ env.CBINDGEN_VERSION }}
-
       - name: Install Rust i686-pc-windows-msvc target
         run: rustup target add i686-pc-windows-msvc
 
-      - name: Install cbindgen
-        run: |
-          cargo install cbindgen --version ${{ env.CBINDGEN_VERSION }}
-          echo "~/.cargo/bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
-        if: steps.cache-cbindgen.outputs.cache-hit != 'true'
-
       - name: Get descriptive libloot version
         id: get-libloot-version
         shell: bash