Adding mingw compiler to windows path in gitlab-ci.

.gitlab-ci.yml

@@ -16,7 +16,7 @@
     expire_in: 1 day
 .windows_before_script: &windows_before_script
   before_script:
-    - set PATH=%PATH%;c:\vendors\git\2.11\cmd;c:\vendors\cmake\3.6.3\bin;c:\vendors\mingw-w64\qt\5.7.0\bin
+    - set PATH=%PATH%;c:\vendors\mingw-w64\x86_64-4.8.5-posix-seh-rt_v4-rev0\mingw64\bin;c:\vendors\git\2.11\cmd;c:\vendors\cmake\3.6.3\bin;c:\vendors\mingw-w64\qt\5.7.0\bin
 stages:
 - configure
 - build