appveyor: Set timezone on the build system

For some reason, setting the time zone via TZ to `GST-1GDT` in the utils test
doesn't work anymore (the DST zone is not considered, it's as if only `GST-1`
was configured).

diff --git a/.appveyor.yml b/.appveyor.yml
index 2c50615..3c826f3 100644 (file)
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -19,6 +19,7 @@ environment:
     #  bits: 32
 
 install:
+  - tzutil /s "Central European Standard Time"
   - set MSYS_SH=C:\msys%BITS%\usr\bin\sh.exe
   - set MSYSTEM=MINGW%BITS%
   - set TEST=win%BITS%