* src/fa.c: clean up error macros
* src/fa.c: clean up error macros

The error macros _E, _F, and _N use names reserved for system libraries;
this leads to compile errors at least on Solaris (as reported by lanky).

Rename _E and _F to E and F, and eliminate _N.

dafugg/augeas,ptoscano/augeas,mlichvar/augeas,GeoffWilliams/augeas,lutter/augeas,kunkku/augeas,jtopjian/augeas,raphink/augeas,hercules-team/augeas-do-not-use,lutter/augeas,ptoscano/augeas,dafugg/augeas,mlichvar/augeas,GeoffWilliams/augeas,raphink/augeas,jtopjian/augeas,hercules-team/augeas-do-not-use,mlichvar/augeas,domcleal/augeas,mchf/augeas,manandbytes/augeas,pevalme/augeas,jasperla/augeas,domcleal/augeas,jjlin/augeas,lutter/augeas,manandbytes/augeas,jjlin/augeas,MikaelSmith/augeas,kumy/augeas,ptoscano/augeas,kumy/augeas,pevalme/augeas,pevalme/augeas,hercules-team/augeas-do-not-use,MikaelSmith/augeas,jasperla/augeas,dafugg/augeas,kunkku/augeas,kunkku/augeas,kumy/augeas,mchf/augeas,hercules-team/augeas,kumy/augeas,jjlin/augeas,domcleal/augeas,hercules-team/augeas