Modernize the build system

[apteryks]

This work was made while adding a pharo-vm package to GNU Guix. With it, packaging should become trivial for most GNU/Linux distributions. The installation layout looks like:

/bin/pharo
/include/pharovm
/include/pharovm/config.h
/include/pharovm/debug.h
/include/pharovm/dispdbg.h
/include/pharovm/errorCode.h
/include/pharovm/exportDefinition.h
/include/pharovm/fileDialog.h
/include/pharovm/imageAccess.h
/include/pharovm/interpreter.h
/include/pharovm/jit
/include/pharovm/jit/jit.h
/include/pharovm/macros.h
/include/pharovm/parameters
/include/pharovm/parameters/parameters.h
/include/pharovm/parameters/parameterVector.h
/include/pharovm/pathUtilities.h
/include/pharovm/pharoClient.h
/include/pharovm/pharo.h
/include/pharovm/semaphores
/include/pharovm/semaphores/pharoSemaphore.h
/include/pharovm/semaphores/platformSemaphore.h
/include/pharovm/semaphores/pSemaphore.h
/include/pharovm/sigjmp_support.h
/include/pharovm/sqaio.h
/include/pharovm/sqAssert.h
/include/pharovm/sqAtomicOps.h
/include/pharovm/sqCogStackAlignment.h
/include/pharovm/sq.h
/include/pharovm/sqMemoryAccess.h
/include/pharovm/sqMemoryFence.h
/include/pharovm/sqNamedPrims.h
/include/pharovm/sqVirtualMachine.h
/include/pharovm/stringUtilities.h
/include/pharovm/threads
/include/pharovm/threadSafeQueue
/include/pharovm/threadSafeQueue/threadSafeQueue.h
/include/pharovm/threads/vmthread.h
/include/pharovm/win
/include/pharovm/win/resources.h
/lib/libB2DPlugin.so
/lib/libDSAPrims.so
/lib/libFileAttributesPlugin.so
/lib/libFilePlugin.so
/lib/libFloatArrayPlugin.so
/lib/libJPEGReaderPlugin.so
/lib/libJPEGReadWriter2Plugin.so
/lib/libLargeIntegers.so
/lib/libMiscPrimitivePlugin.so
/lib/libPharoVMCore.so
/lib/libSocketPlugin.so
/lib/libSurfacePlugin.so
/lib/libUnixOSProcessPlugin.so