iox-#32 Update readme with alternate build instructions
iox-#32 Update readme with alternate build instructions

Signed-off-by: Prasanna Bhat <e5bee0ecd0115ae065310834f9446360b4c750cd@gmail.com>

eclipse-iceoryx/iceoryx,eclipse-iceoryx/iceoryx,eclipse-iceoryx/iceoryx,eclipse-iceoryx/iceoryx