[avr-gcc-list] avr-libc and version info macro

[Henrik Maier]

avr-libc is steadily improving. In the past some features where not 
available (like EEPROM support for AT90CAN128) or some API functions 
have changed. I am missing a method to check during compile time against 
a particular version of avr-libc.
Something like #if __AVRLIBC_VER__ >= 125 /*Has EEPROM for AT90CAN128*/
would be useful.

I have seen a __AVRLIBC__ macro in the configure script but it doesn't 
seem to be inserted in any of the header files. It also does not contain 
the build("5") number only major("1") and minor("2").

Henrik
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