* let BuildSetup set HAIKU_HOST_IS_BIG_ENDIAN according to HOST_GCC_MACHINE
* minor cleanup in BuildSetup
* when building ICU, set the endianness indicator suffix according to
HAIKU_HOST_IS_BIG_ENDIAN
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34864 a95241bf-73f2-0310-859d-f6bbb57e9c96