appveyor.yml: improve build process

tools/build.bat

@@ -8,10 +8,10 @@ set CrossCert="%~dp0DigiCert High Assurance EV Root CA.crt"
 set Issuer="DigiCert"
 set Subject="Navimatics Corporation"
 
-call "%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat"
-
 if not X%1==X set Configuration=%1
 
+call "%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat" x64
+
 cd %~dp0..\build\VStudio
 if exist build\ del /s/q build >nul
 

tools/nmake-test.bat

@@ -0,0 +1,11 @@
+@echo off
+
+setlocal
+
+set Configuration=Release
+if not X%1==X set Configuration=%1
+
+call "%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat" x64
+
+cd %~dp0..\ext\test
+nmake /f Nmakefile