Rename travis "arm" BUILD_ARCH to "arm-apcs".

These platforms are built with an old ARM compiler that supports the
deprecated APCS standard.

.travis.yml

@@ -20,8 +20,8 @@ before_script:
   - sudo apt-get -qq install libc6:i386 libgcc1:i386 gcc-4.6-base:i386
       libstdc++5:i386 libstdc++6:i386
 
-  ## Install toolchain for mc1233x, cc2538 and mbxxx in care-free way
-  - if [ ${BUILD_ARCH:-0} = arm ] ; then
+  ## Install old APCS ARM toolchain for mc1233x, cc2538 and mbxxx
+  - if [ ${BUILD_ARCH:-0} = arm-apcs ] ; then
       $WGET https://raw.githubusercontent.com/wiki/malvira/libmc1322x/files/arm-2008q3-66-arm-none-eabi-i686-pc-linux-gnu.tar.bz2 &&
       tar xjf arm-2008q3*.tar.bz2 -C /tmp/ &&
       sudo cp -f -r /tmp/arm-2008q3/* /usr/ &&
@@ -93,6 +93,6 @@ env:
 #  - BUILD_TYPE='ipv4'
   - BUILD_TYPE='ipv6-apps'
   - BUILD_TYPE='compile-8051-ports' BUILD_CATEGORY='compile' BUILD_ARCH='8051'
-  - BUILD_TYPE='compile-arm-ports' BUILD_CATEGORY='compile' BUILD_ARCH='arm'
+  - BUILD_TYPE='compile-arm-apcs-ports' BUILD_CATEGORY='compile' BUILD_ARCH='arm-apcs'
   - BUILD_TYPE='compile-6502-ports' BUILD_CATEGORY='compile' BUILD_ARCH='6502'
   - BUILD_TYPE='slip-radio' MAKE_TARGETS='cooja'