Symbian/Linux: Enable building with makefile-based system.

- Autodetect SDK by environment variable EPOCROOT and qt directory
below.
- Environment::appendOrSet/prependOrSet: Avoid duplicate entries
- Rename toolchain enumeration value
- Adapt S60ToolChainMixin to new GnuPoc setup, provide routines for
  all required variables.
- RVCTToolChain: Make RVCT detection smarter (Check for RVCT<v1><v2>BIN
  variable). Set all required variables in case of RVCTToolChain/GnuPoc
- QtVersionManager: Detect toolchain and Qt version properly, make S60
  device run config accept toolchain.
- Modify S60DeviceRunControl to execute 'make sis'
- Modify S60Devices::detectQt...() to check for Qt installed into SDK
  first and symlink as fallback.

src/plugins/qt4projectmanager/qt4buildconfiguration.cpp

@@ -305,13 +305,13 @@ QString Qt4BuildConfiguration::defaultMakeTarget() const
 
     switch (tc->type()) {
     case ToolChain::GCCE:
-    case ToolChain::GCCE_GNUPOC:
         return symbianMakeTarget(buildConfig, QLatin1String("gcce"));
     case ToolChain::RVCT_ARMV5:
         return symbianMakeTarget(buildConfig, QLatin1String("armv5"));
     case ToolChain::RVCT_ARMV6:
-    case ToolChain::RVCT_ARMV6_GNUPOC:
         return symbianMakeTarget(buildConfig, QLatin1String("armv6"));
+    case ToolChain::RVCT_ARMV5_GNUPOC:
+    case ToolChain::GCCE_GNUPOC:
     default:
         break;
     }