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/sqrt.R
# Description: C math library demo (dynbind demo) 

dynbind( c("msvcrt","m","m.so.6"), "sqrt(d)d;" )
print(sqrt)
sqrt(144)