Ensure we identify the compiler as g++ in configure

Our PLATFORM in OE is ${TARGET_OS}-oe-g++, and previously the configure
script was interpreting from this that the compiler was "oe-g++" and thus
g++ specific checks were not being run since this string did not match;
among other things this resulted in a compiler version check in the
QtWebKit build code not working, and hence the following error at build
time:

./wtf/NullPtr.h:48:1: error: identifier 'nullptr' will become a keyword in C++0x [-Werror=c++0x-compat]

The easiest thing since our PLATFORM is entirely artificial is to just
force COMPILER to "g++" in the configure script if it is detected as
"oe-g++".

Upstream-Status: Inappropriate [configuration]

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

--- qt-everywhere-opensource-src-4.8.0.orig/configure
+++ qt-everywhere-opensource-src-4.8.0/configure
@@ -7444,6 +7444,9 @@ elif [ "$XPLATFORM" != "$PLATFORM" ]; th
 else
     COMPILER=`echo $PLATFORM | cut -f 2- -d-`
 fi
+case $COMPILER in
+    *oe-g++) COMPILER="g++" ;;
+esac
 if [ "$CFG_EXCEPTIONS" = "unspecified" -a "$PLATFORM_QWS" = "yes" ]; then
     CFG_EXCEPTIONS=no
 fi