fix is_msvc and use_hot_reload variables

(cherry picked from commit 648b8c4)

tools/godotcpp.py

@@ -239,6 +239,15 @@ def generate(env):
 
     print("Building for architecture " + env["arch"] + " on platform " + env["platform"])
 
+    tool = Tool(env["platform"], toolpath=["tools"])
+
+    if tool is None or not tool.exists(env):
+        raise ValueError("Required toolchain not found for platform " + env["platform"])
+
+    tool.generate(env)
+    target_tool = Tool("targets", toolpath=["tools"])
+    target_tool.generate(env)
+
     # Disable exception handling. Godot doesn't use exceptions anywhere, and this
     # saves around 20% of binary size and very significant build time.
     if env["disable_exceptions"]:
@@ -249,15 +258,6 @@ def generate(env):
     elif env.get("is_msvc", False):
         env.Append(CXXFLAGS=["/EHsc"])
 
-    tool = Tool(env["platform"], toolpath=["tools"])
-
-    if tool is None or not tool.exists(env):
-        raise ValueError("Required toolchain not found for platform " + env["platform"])
-
-    tool.generate(env)
-    target_tool = Tool("targets", toolpath=["tools"])
-    target_tool.generate(env)
-
     # Require C++17
     if env.get("is_msvc", False):
         env.Append(CXXFLAGS=["/std:c++17"])