CI win: QTDIR w/o conversion

.gitlab-ci.yml

@@ -27,7 +27,7 @@ windows:
     - cd build
     - cmd.exe "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars64.bat"
     - cmake --version
-    - cmake -G "Visual Studio 16 2019" -A x64 -T host=x64 -DLIB_MAN=OFF -DQTDIR=C:\Qt\5.14.1\msvc2017_64 -DCPACK_IFW_ROOT=C:\Qt\Tools\QtInstallerFramework\3.2 -B. ..
+    - cmake -G "Visual Studio 16 2019" -A x64 -T host=x64 -DLIB_MAN=OFF -DQTDIR=C:/Qt/5.14.1/msvc2017_64 -DCPACK_IFW_ROOT=C:\Qt\Tools\QtInstallerFramework\3.2 -B. ..
     - cmake --build . --config Release
     - Get-Location
     - dir

GUI/coregui/CMakeLists.txt

@@ -115,7 +115,6 @@ install (TARGETS ${library_name} DESTINATION ${destination_lib} COMPONENT Librar
 
 if(WIN32)
     # --- Qt ---
-    string(REGEX REPLACE "\\\\" "/" QTDIR $ENV{QTDIR} ) # Convert C:\Qt\ to C:/Qt/
     install(FILES
     ${QTDIR}/bin/Qt5Widgets.DLL
     ${QTDIR}/bin/Qt5Core.dll