Fix Windows MSVC build

Update the CMake tool so it respects the use_static_cpp godot-cpp option
compiling with the proper CRT.

Fix inclusion of secur32 in git2 tool.

tools/git2.py

@@ -53,6 +53,8 @@ def build_library(env, deps):
 
     env.Append(CPPPATH=["#thirdparty/git2/libgit2/include"])
     env.Prepend(LIBS=git2[1:])
+    if env["platform"] == "windows":
+        env.PrependUnique(LIBS=["secur32"])
 
     return git2