[CI] Use static Qt libraries from static build

.appveyor.yml

@@ -43,8 +43,8 @@ clone_folder: c:\dev\xenia
 
 # environment variables
 environment:
-  QT_BIN: C:\Qt\5.10.1\msvc2017_64\bin
-  QT_DIR: C:\Qt\5.10.1-static\msvc2017_64
+  QT_DIR: C:\Qt\5.10.1\msvc2017_64
+  QT_LIB: C:\Qt\5.10.1-static\msvc2017_64\lib
   my_var2: value2
 
 # build cache to preserve files/folders between builds

src/xenia/app/premake5.lua

@@ -44,8 +44,8 @@ project("xenia-app")
   qt.enable()
   qtmodules{"core", "gui", "widgets"}
   qtprefix "Qt5"
-  if os.getenv("QT_BIN") then
-    qtbinpath(os.getenv("QT_BIN"))
+  if os.getenv("QT_LIB") then
+    qtlibpath(os.getenv("QT_LIB"))
   end
 
   configuration {"Debug"}