Fixed build error. Create output libraries for windows

Author: smasherprog

.appveyor.yml

@@ -13,12 +13,11 @@ environment:
   - SHARED: OFF
     POSTFIXNAME: MT
     POSTVCPKGNAME: -static
-    EXTRAFLAGS: -DVCPKG_TARGET_TRIPLET=x86-windows-static
+        
   - SHARED: ON
     POSTFIXNAME: MD
     POSTVCPKGNAME:
-    EXTRAFLAGS:
-           
+    
 matrix:
   fast_finish: true
 
@@ -47,8 +46,9 @@ install:
 build_script:
   - if %platform%==x86 set generator=Visual Studio 15 2017
   - if %platform%==x64 set generator=Visual Studio 15 2017 Win64
+  - if %POSTFIXNAME%==MT set VCPKGFLAGS=-DVCPKG_TARGET_TRIPLET=%platform%-windows-static
   - cmd: echo %generator% %SHARED% %configuration% 
-  - cmd: cmake "-DCMAKE_TOOLCHAIN_FILE=%cd%\vcpkg\scripts\buildsystems\vcpkg.cmake" -G"%generator%" %EXTRAFLAGS% -DBUILD_SHARED_LIBS=%SHARED% -DCMAKE_INSTALL_PREFIX=./output .. 
+  - cmd: cmake "-DCMAKE_TOOLCHAIN_FILE=%cd%\vcpkg\scripts\buildsystems\vcpkg.cmake" -G"%generator%" %VCPKGFLAGS% -DBUILD_SHARED_LIBS=%SHARED% -DCMAKE_INSTALL_PREFIX=./output .. 
   - cmd: cmake --build . --target INSTALL --config %configuration%
   - 7z a vc140_%configuration%_%PLATFORM%_%POSTFIXNAME%.zip  -i!%APPVEYOR_BUILD_FOLDER%\build\output\*
   - appveyor PushArtifact vc140_%configuration%_%PLATFORM%_%POSTFIXNAME%.zip