ci: unify the test timeout multiplier across jobs

Introduce a MESON_TEST_TIMEOUT_MULTIPLIER env var and use it in all test scripts.

.gitlab-ci.yml

@@ -9,6 +9,9 @@ cache:
   paths:
     - _ccache/
 
+variables:
+  MESON_TEST_TIMEOUT_MULTIPLIER: 2
+
 fedora-meson-x86_64:
   stage: build
   variables:
@@ -17,7 +20,7 @@ fedora-meson-x86_64:
     - meson --prefix /usr --libdir /usr/lib64 --buildtype debug --werror -Dsystemtap=true -Ddtrace=true _build .
     - cd _build
     - ninja
-    - meson test --timeout-multiplier 2
+    - meson test --timeout-multiplier ${MESON_TEST_TIMEOUT_MULTIPLIER}
     - cd ..
     - mkdir -p _coverage
     - lcov --rc lcov_branch_coverage=1 --directory . --capture --no-external --output-file "_coverage/${CI_JOB_NAME}.lcov"

.gitlab-ci/test-msvc.bat

@@ -8,7 +8,7 @@ call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary
 meson _build || goto :error
 ninja -C _build || goto :error
 
-meson test -C _build --timeout-multiplier 4 || goto :error
+meson test -C _build --timeout-multiplier %MESON_TEST_TIMEOUT_MULTIPLIER% || goto :error
 
 :: FIXME: can we get code coverage support?
 

.gitlab-ci/test-msys2.sh

@@ -35,7 +35,7 @@ cd _build
 ninja
 
 # FIXME: fix the test suite
-meson test || true
+meson test --timeout-multiplier ${MESON_TEST_TIMEOUT_MULTIPLIER} || true
 
 cd ..
 curl -O -J -L "https://github.com/linux-test-project/lcov/releases/download/v1.13/lcov-1.13.tar.gz"