community/*: remove unnecessary "cd $builddir"

community/a52dec/APKBUILD

community/aircrack-ng/APKBUILD

community/alpine-make-vm-image/APKBUILD

community/aoetools/APKBUILD

community/aom/APKBUILD

community/bannergrab/APKBUILD

community/bsm-simple-themes/APKBUILD

community/cachefilesd/APKBUILD

community/cdrkit/APKBUILD

community/chntpw/APKBUILD

community/clamsmtp/APKBUILD

community/cntlm/APKBUILD

community/copy-router-config/APKBUILD

community/cpptest/APKBUILD

community/csync2/APKBUILD

community/dcadec/APKBUILD

community/detenc/APKBUILD

community/dhcp-helper/APKBUILD

community/dsfmt/APKBUILD

community/dvd+rw-tools/APKBUILD