litex_setup: Remove Travis specific code (CI no longer run on Travis).

litex_setup.py

@@ -92,11 +92,6 @@ def sifive_riscv_download():
 
 # Setup --------------------------------------------------------------------------------------------
 
-if os.environ.get("TRAVIS", "") == "true":
-    # Ignore `ssl.SSLCertVerificationError` on CI.
-    import ssl
-    ssl._create_default_https_context = ssl._create_unverified_context
-
 if len(sys.argv) < 2:
     print("Available commands:")
     print("- init")