[avr-libc-dev] Extra info for FAQ

[Symes]

Just dropping a line to suggest an improvment to the FAQ.

In the area titled  

"I get "undefined reference to..." for functions like "sin()" "

It might be extra helpful to add a paragraph something along the lines of:

"If using a makefile to assist compilation, including the actual .c source 
files used to create the missing library in the "SRC=" directive may result in 
the correct generation of the missing library. For example "SRC = 
../avrlib/ds1631.c $(TARGET).c" will create the missing library to avoid an 
error of "undefined reference to `<function within ds1631.c>'"


This issue had this linux newbie stumped for a little while, hopefully the 
inclusion of  a paragraph similar to the one above may save other newbies some 
time

Yours faithfully,
Nigel Symes