libast: cleanup: remove unused pathkey function (re: 3677046)

The pathkey function calculates a 14-character hash out of the path
to a compiler command ("language processor"). The removed pathprobe
function was the only user of the pathkey function, so it is hereby
removed for the same reasons.

Author: McDutchie

src/lib/libast/Mamfile

@@ -1141,15 +1141,6 @@ make install virtual
 			exec - compile %{<}
 		done
 
-		make pathkey.o
-			make path/pathkey.c
-				prev ast_api.h
-				prev include/ls.h
-				prev include/ast.h
-			done
-			exec - compile %{<}
-		done
-
 		make pathrepl.o
 			make path/pathrepl.c
 				prev ast_api.h

src/lib/libast/features/api

@@ -8,7 +8,7 @@ api ast 20120411 cmdopen
 
 api ast 20110505 cmdopen
 
-api ast 20100601 pathaccess pathcanon pathcat pathkey pathpath pathrepl
+api ast 20100601 pathaccess pathcanon pathcat pathpath pathrepl
 
 api ast 20000308 sfkeyprintf
 

src/lib/libast/include/ast.h

@@ -365,8 +365,6 @@ extern char*		pathfind(const char*, const char*, const char*, char*, size_t);
 extern int		pathgetlink(const char*, char*, int);
 extern int		pathicase(const char*);
 extern int		pathinclude(const char*);
-extern char*		pathkey(char*, char*, const char*, const char*, const char*);
-extern char*		pathkey_20100601(const char*, const char*, const char*, char*, size_t, char*, size_t);
 extern size_t		pathnative(const char*, char*, size_t);
 extern char*		pathpath(char*, const char*, const char*, int);
 extern char*		pathpath_20100601(const char*, const char*, int, char*, size_t);

src/lib/libast/man/path.3

@@ -51,7 +51,6 @@ char*     pathcd(char* \fIpath\fP, const char* \fIhome\fP);
 int       pathcheck(const char* \fIpackage\fP, const char* \fItool\fP, Pathcheck_t* \fIpc\fP);
 int       pathgetlink(const char* \fIname\fP, char* \fIbuf\fP, int \fIsiz\fP);
 int       pathicase(const char* \fIpath\fP);
-char*     pathkey(char* \fIkey\fP, char* \fIattr\fP, const char* \fIlang\fP, const char* \fIpath\fP);
 char*     pathnext(char* \fIpath\fP, char* \fIextra\fP, long* \fIvisits\fP);
 char*     pathpath(char* \fIpath\fP, const char* \fIp\fP, const char* \fIa\fP, int \fImode\fP);
 char*     pathrepl(char* \fIpath\fP, const char* \fImatch\fP, const char* \fIreplace\fP);
@@ -256,25 +255,6 @@ with
 set to
 .LR ENOSYS .
 .PP
-.L pathkey
-generates in
-.I key
-a 14 character lookup key (plus terminating 0) for the language
-.I lang
-processor in
-.IR path .
-A pointer to the key is returned, 0 on error.
-If
-.I "key == 0"
-then space is allocated via
-.IR malloc (3).
-Key specific attribute
-.I name=value
-pairs are copied into
-.I attr
-if
-.IR "attr != 0" .
-.PP
 .L pathpath
 constructs in
 .I path