RFR(XS): 8161262: Fix jdk build with gcc 4.1.2: -fno-strict-overflow not known.

[Lindenmaier, Goetz]

Hi,

we are building the jdk7u ppc port on gcc 4.1.2.  This fails since
"8147466: Add -fno-strict-overflow to IndicRearrangementProcessor{,2}.cpp"
as the gcc flag introduced there is not known to gcc 4.1.2.
I just guard it by the compiler version.

Please review this change.
http://cr.openjdk.java.net/~goetz/wr16/8161262-jdkGcc412/webrev.01/

Best regards,
  Goetz.