Give each coverage build a unique name.

Travis builds are currently build number (123.1, 123.2, etc.) and
AppVeyor is some random string, making it hard to determine which builds
cover what.

.appveyor.yml

@@ -90,7 +90,7 @@ after_test:
   - cmd: "%WRAPPER% %PYTHON% -m coverage combine"
   # Generate XML report manually because codecov module doesn't know how to run it properly.
   - cmd: "%WRAPPER% %PYTHON% -m coverage xml"
-  - cmd: "%WRAPPER% %PYTHON% -m codecov -X search pycov -f coverage.xml"
+  - cmd: "%WRAPPER% %PYTHON% -m codecov -X search pycov -f coverage.xml -n windows-%arch%-%compiler%-%backend%"
 
 on_finish:
   - set "PATH=%ORIG_PATH%"

.travis.yml

@@ -53,4 +53,4 @@ script:
 
 after_success:
   - coverage3 combine
-  - codecov
+  - codecov -n "${TRAVIS_OS_NAME}-${CC}-{$(echo ${MESON_ARGS} | sed -e 's/^--//g' -e 's/ --/,/g')}"