Allow to build third-party on FreeBSD
FreeBSD does not use GNU make by default, but it is avaialble as gmake. Usually it is not a problem, but in minoca third-party build system, shell scripts explicitly use 'make' and considering that it is always GNU make.
This patch fixes all shellscripts to use $MAKE, and also initializes it in build/build_common.sh and build/common.mk.