Patch to fix build breakage with GCC 4.7

[Deepak Bhole]

Hi,

JDK builds currently fail with GCC 4.7 due to its stricter option
checking.

GCC 4.6 and prior ignored invalid options -- GCC 4.7 does not. Certain
files in JDK supply the -mimpure-text option to GCC. This option is only
valid on SPARC[1,2]. As a result, GCC 4.7 throws an error during build
on Linux (I suppose .

This patch removes the option:
http://cr.openjdk.java.net/~dbhole/GCC-4.7-JDK8.00

1: http://gcc.gnu.org/onlinedocs/gcc-3.3.6/gcc/SPARC-Options.html
2: http://gcc.gnu.org/onlinedocs/gcc-3.3.6/gcc/i386-and-x86_002d64-Options.html

If OK for push, please feel free to do so (I don't have commit access).

Cheers,
Deepak