Work around a problem with Bison on FreeBSD
Work around a problem with Bison on FreeBSD

Bison looks for _STDLIB_H to see if stdlib.h has been included, but the
system includes use _STDLIB_H_; that makes Bison think malloc/free have not
been declared yet and it goes and does that. gcc then complains about the
duplicate declaration.

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