add gcc 3.4.6 to the list of compilers to look for

The following patch adds gcc-3.4.6 (as used by gentoo's gcc-3.4.6-r2 package) to the list of compilers to test for compatibility.

This is also the last version for the gcc-3.4.x and gcc-3.x series which hasn't had an update in 19 months and therefore most likely stable enough to be called by full version number.

All other distributions that don't have a binary with this name will just skip this entry and therefore should been unaffected by the change.

Carlo

---
Index: configure
===================================================================
RCS file: /sources/qemu/qemu/configure,v
retrieving revision 1.165

diff -u -r1.165 configure
@@ -23,7 +23,7 @@
 cross_prefix=""
 cc="gcc"
 gcc3_search="yes"
-gcc3_list="gcc-3.4 gcc34 gcc-3.3.6 gcc-3.3 gcc33 gcc-3.2 gcc32"
+gcc3_list="gcc-3.4.6 gcc-3.4 gcc34 gcc-3.3.6 gcc-3.3 gcc33 gcc-3.2 gcc32"
 host_cc="gcc"
 ar="ar"
 make="make"