Drop Symbian Carbide settings from .gitignore

Change-Id: I429343246714e26690ffd9748e5e6873509c6625
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>

.gitignore

@@ -261,13 +261,6 @@ d_exc_*.stk
 # Generated by abldfast.bat from devtools.
 .abldsteps.*
 
-# Carbide project files
-# ---------------------
-.project
-.cproject
-.make.cache
-*.d
-
 qtc-debugging-helper
 qtc-qmldump
 qtc-qmldbg