Revert "Use a 64-bit C compiler on Windows to build wheels (#10097)"

This reverts commit d308210.

Author: JukkaL

misc/build_wheel.py

@@ -32,12 +32,6 @@
 # Clang package we use on Linux
 LLVM_URL = 'https://github.com/mypyc/mypy_mypyc-wheels/releases/download/llvm/llvm-centos-5.tar.gz'
 
-# Script to configure 64-bit MSVC compiler executable
-VCVARS64 = (
-    r'C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise' +
-    r'\VC\Auxiliary\Build\vcvars64.bat'
-)
-
 # Mypy repository root
 ROOT_DIR = os.path.dirname(os.path.dirname(__file__))
 
@@ -59,22 +53,18 @@ def create_environ(python_version: str) -> Dict[str, str]:
     #
     # TODO: remove use of mypy-requirements.txt once we no longer need to support
     #       building pre modular typeshed releases
-    install_deps = """
+    env['CIBW_BEFORE_BUILD'] = """
       pip install -r {package}/mypy-requirements.txt &&
       (pip install -r {package}/build-requirements.txt || true)
     """.replace('\n', ' ')
-    env['CIBW_BEFORE_BUILD'] = install_deps
 
     # download a copy of clang to use to compile on linux. this was probably built in 2018,
     # speeds up compilation 2x
-    env['CIBW_BEFORE_BUILD_LINUX'] = (
-        "(cd / && curl -L %s | tar xzf -) && %s" % (LLVM_URL, install_deps)
-    )
-
-    # IMPORTANT: The build can run out of memory if we don't use a 64-bit compiler on Windows.
-    env['CIBW_BEFORE_BUILD_WINDOWS'] = (
-        'call "%s" && %s' % (VCVARS64, install_deps)
-    )
+    env['CIBW_BEFORE_BUILD_LINUX'] = """
+      (cd / && curl -L %s | tar xzf -) &&
+      pip install -r {package}/mypy-requirements.txt &&
+      (pip install -r {package}/build-requirements.txt || true)
+    """.replace('\n', ' ') % LLVM_URL
 
     # the double negative is counterintuitive, https://github.com/pypa/pip/issues/5735
     env['CIBW_ENVIRONMENT'] = 'MYPY_USE_MYPYC=1 MYPYC_OPT_LEVEL=3 PIP_NO_BUILD_ISOLATION=no'