made erlang binding work with system *installed* dyncall: - made build use static libraries (used .o files directly) - removed custom flags for include path and relying on CFLAGS now - change cc to $(CC) - readme update with build instructions, etc.

# Package: rdyncall 
# File: demo/R_ShowMessage.R
# Description: Show R Dialog Message (dynbind demo)

dynbind("R","R_ShowMessage(Z)v;")
R_ShowMessage("hello")