src/sage/env.py: Remove commented-out cygwin code

Author: Matthias Koeppe

src/sage/env.py

@@ -468,10 +468,6 @@ def uname_specific(name, value, alternative):
 
     aliases["ARB_LIBRARY"] = ARB_LIBRARY
 
-    # TODO: Remove Cygwin hack by installing a suitable cblas.pc
-    # if os.path.exists('/usr/lib/libblas.dll.a'):
-    #    aliases["CBLAS_LIBS"] = ['gslcblas']
-
     try:
         aliases["M4RI_CFLAGS"].remove("-pedantic")
     except (ValueError, KeyError):