Remove apathmax() and implicitly agetcwd()

pathconf() is just an insane interface to use. All sane operating-
systems set sane values for PATH_MAX. Due to the by-runtime-nature of
pathconf(), it actually weakens the programs depending on its values.

Given over 3 years it has still not been possible to implement a sane
and easy to use apathmax()-utility-function, and after discussing this
on IRC, we'll dump this garbage.

We are careful enough not to overflow PATH_MAX and even if, any user
is able to set another limit in config.mk if he so desires.

util.h

@@ -20,9 +20,6 @@
 
 extern char *argv0;
 
-char *agetcwd(void);
-void apathmax(char **, size_t *);
-
 void *ecalloc(size_t, size_t);
 void *emalloc(size_t);
 void *erealloc(void *, size_t);