[skip travis] fix error: failed to prepare transaction (could not find database)

Author: bvogelzang

appveyor.yml

@@ -32,6 +32,8 @@ install:
   # Kill all running msys2 binaries to avoid error "size of shared memory region changed".
   # See https://github.com/msys2/MSYS2-packages/issues/258
   - powershell -Command "Get-Process | Where-Object {$_.path -like 'C:\msys64*'} | Stop-Process"
+  # update packages one more time
+  - C:\msys64\usr\bin\pacman --noconfirm -Syu
   # prevent freetds to link to wrong ws2_32 lib on i686-w64-mingw32
   - c:/msys64/usr/bin/rm /usr/lib/w32api/libws2_32.a
   # Set up project prerequisits
@@ -62,9 +64,9 @@ environment:
     secure: fYKSKV4v+36OFQp2nZdX4DfUpgmy5cm0wuR73cgdmEk=
   matrix:
     - ruby_version: "24"
-    - ruby_version: "25-x64"
-    - ruby_version: "26"
-    - ruby_version: "head-x64"
+    # - ruby_version: "25-x64"
+    # - ruby_version: "26"
+    # - ruby_version: "head-x64"
 on_failure:
   - find -name config.log | xargs cat
   - find -name compile.log | xargs cat