[buildcore] Windows fixes

deps/buildcore/base.mk

@@ -10,10 +10,9 @@ ifeq (${OS},Windows_NT)
 	SHELL := powershell.exe
 	.SHELLFLAGS := -NoProfile -Command
 	BC_VAR_OS=windows
+	BC_CMD_HOST_PY3=python
 else
 	BC_VAR_OS=$(shell uname | tr [:upper:] [:lower:])
-endif
-
 	ifneq ($(shell which python3 2> /dev/null),)
 		BC_CMD_HOST_PY3=python3
 	else
@@ -24,6 +23,8 @@ else
 			exit 1
 		endif
 	endif
+endif
+
 
 ifdef BC_VAR_USE_DOCKER_DEVENV
 	ifneq ($(shell which docker 2> /dev/null),)

deps/buildcore/scripts/setup-build.py

@@ -96,7 +96,7 @@ def main() -> int:
         cmake_cmd.append(build_tool)
     if qt_path != '':
         cmake_cmd.append(qt_path)
-    if platform.system() == 'Windows':
+    if platform.system() == 'Windows' and platform.system() == 'AMD64':
         cmake_cmd.append('-A x64')
 
     cmake_err = subprocess.run(cmake_cmd).returncode

deps/buildcore/scripts/util.py

@@ -32,7 +32,7 @@ def get_os() -> str:
 
 
 def get_arch() -> str:
-    arch = platform.machine()
-    if arch.lower() == 'amd64':
+    arch = platform.machine().lower()
+    if arch == 'amd64':
         arch = 'x86_64'
     return arch