Add support for Visual Studio 2017

mach.bat

@@ -1,6 +1,22 @@
 @echo off
 
-SET VS_VCVARS=%VS140COMNTOOLS%..\..\VC\vcvarsall.bat
+IF EXIST "%ProgramFiles(x86)%" (
+  set "ProgramFiles32=%ProgramFiles(x86)%"
+) ELSE (
+  set "ProgramFiles32=%ProgramFiles%"
+)
+
+set VC14VARS=%VS140COMNTOOLS%..\..\VC\vcvarsall.bat
+IF EXIST "%VC14VARS%" (
+  set "VS_VCVARS=%VC14VARS%"
+) ELSE (
+  for %%e in (Enterprise Professional Community) do (
+    IF EXIST "%ProgramFiles32%\Microsoft Visual Studio\2017\%%e\VC\Auxiliary\Build\vcvarsall.bat" (
+      set "VS_VCVARS=%ProgramFiles32%\Microsoft Visual Studio\2017\%%e\VC\Auxiliary\Build\vcvarsall.bat"
+    )
+  )
+)
+
 IF EXIST "%VS_VCVARS%" (
   IF NOT DEFINED Platform (
     IF EXIST "%ProgramFiles(x86)%" (
@@ -11,8 +27,8 @@ IF EXIST "%VS_VCVARS%" (
     )
   )
 ) ELSE (
-  ECHO Visual Studio 2015 is not installed.
-  ECHO Download and install Visual Studio 2015 from https://www.visualstudio.com/
+  ECHO Visual Studio 2015 or 2017 is not installed.
+  ECHO Download and install Visual Studio 2015 or 2017 from https://www.visualstudio.com/
   EXIT /B
 )
 

python/servo/util.py

@@ -50,7 +50,7 @@ def host_triple():
     cpu_type = platform.machine().lower()
     if os_type.endswith("-msvc"):
         # vcvars*.bat should set it properly
-        platform_env = os.environ.get("PLATFORM")
+        platform_env = os.environ.get("PLATFORM").upper()
         if platform_env == "X86":
             cpu_type = "i686"
         elif platform_env == "X64":