Initial import of libdpf.

Co-authored-by: Cursor <cursoragent@cursor.com>

thirdparty/simde/.appveyor.yml

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+environment:
+  MESON_EXE_WRAPPER: "['C:\\Program Files\\OpenCppCoverage\\OpenCppCoverage.exe', '--export_type=cobertura', '--']"
+  matrix:
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      VCVARSALL: C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat
+      PYTHON_DIR: C:\Python38-x64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      VCVARSALL: C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat
+      PYTHON_DIR: C:\Python38-x64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      VCVARSALL: C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat
+      PYTHON_DIR: C:\Python38-x64
+
+branches:
+  except:
+    - /^ci/(?!appveyor)(/.+)?/
+
+platform:
+  - x64
+
+install:
+  - cmd: set PATH=%PYTHON_DIR%;%PYTHON_DIR%\scripts;%PATH%
+  - cmd: pip install --upgrade ninja meson
+  - cmd: choco install opencppcoverage codecov
+  - cmd: call "%VCVARSALL%" amd64
+
+before_build:
+  - ps: |
+      git submodule -q update --init --recursive
+
+build_script:
+  - cmd: meson --backend=ninja build
+  - cmd: ninja -C build -v test
+
+## This seems to work; data shows up on CodeCov, but it emits an error
+## which makes AppVeyor thing the whole build failed.  Example:
+## https://ci.appveyor.com/project/quixdb/ci-noise/build/job/e7d1wpt9icu77fn2
+# after_test:
+#   - ps: |
+#       Invoke-WebRequest -Uri 'https://codecov.io/bash' -OutFile codecov.sh
+#       $env:APPVEYOR="true"
+#       $env:CI="true"
+#       bash codecov.sh -f "run-testsCoverage.xml"