[travis-ci] debugging ci failures on travis (#2387)

* [travis-ci] debugging ci failures on travis

* [travis-ci] Use JSON to encode env vars

* [travis-ci] Use a more broadly compatible before_all command

* Drop CIBW_ENABLE=all on Travis windows
It doesn't fit into the time limit

* [travis-ci] try upgrading certifi to get around SSL errors

* Revert "[travis-ci] try upgrading certifi to get around SSL errors"

This reverts commit 02eee0e1946d2116d1ce23ccd86945ad33d1ae24.

* [travis-ci] upgrade windows certificates

* [travis-ci] re-enable linux builds

* Drop CIBW_ENABLE=all on Travis Linux

It doesn't fit into the time limit

---------

Co-authored-by: mayeut <mayeut@users.noreply.github.com>

cibuildwheel/platforms/windows.py

@@ -1,3 +1,4 @@
+import json
 import os
 import platform as platform_module
 import shutil
@@ -350,28 +351,22 @@ def setup_python(
             text=True,
         ).strip()
         log.notice(f"Discovering Visual Studio for GraalPy at {vcpath}")
-        env.update(
-            dict(
-                [
-                    envvar.strip().split("=", 1)
-                    for envvar in subprocess.check_output(
-                        [
-                            f"{vcpath}\\Common7\\Tools\\vsdevcmd.bat",
-                            "-no_logo",
-                            "-arch=amd64",
-                            "-host_arch=amd64",
-                            "&&",
-                            "set",
-                        ],
-                        shell=True,
-                        text=True,
-                        env=env,
-                    )
-                    .strip()
-                    .split("\n")
-                ]
-            )
+        vcvars = subprocess.check_output(
+            [
+                f"{vcpath}\\Common7\\Tools\\vsdevcmd.bat",
+                "-no_logo",
+                "-arch=amd64",
+                "-host_arch=amd64",
+                "&&",
+                "python",
+                "-c",
+                "import os, json, sys; json.dump(dict(os.environ), sys.stdout);",
+            ],
+            shell=True,
+            text=True,
+            env=env,
         )
+        env.update(json.loads(vcvars))
 
     return base_python, env