* debian/rules, debian/control: use gcc-4.2/g++-4.2 on all architectures * debian/patches/autoconf-regen: update configure patch to enable force-no-pragma-visibility-for-gcc-4.2_4.3 patch during build * debian/patches/force-no-pragma-visibility-for-gcc-4.2_4.3, debian/patches/series: don't use visibility gcc pragmas; fix build-failure on gcc 4.2 and 4.3.