- Remove const'ness from dlerror(3) prototype, for consistency with POSIX.

Approved by:	cognet
MFC after:	1 week

include/dlfcn.h

@@ -113,8 +113,7 @@ typedef struct  dl_serinfo {
 __BEGIN_DECLS
 /* XSI functions first. */
 int	 dlclose(void *);
-const char *
-	 dlerror(void);
+char	*dlerror(void);
 void	*dlopen(const char *, int);
 void	*dlsym(void * __restrict, const char * __restrict);
 

lib/libc/gen/dlfcn.c

@@ -34,7 +34,7 @@ __FBSDID("$FreeBSD$");
 #include <link.h>
 #include <stddef.h>
 
-static const char sorry[] = "Service unavailable";
+static char sorry[] = "Service unavailable";
 
 /*
  * For ELF, the dynamic linker directly resolves references to its
@@ -69,7 +69,7 @@ dlclose(void *handle)
 }
 
 #pragma weak dlerror
-const char *
+char *
 dlerror(void)
 {
 	return sorry;

lib/libc/gen/dlopen.3

@@ -52,7 +52,7 @@
 .Fn dlsym "void * restrict handle" "const char * restrict symbol"
 .Ft dlfunc_t
 .Fn dlfunc "void * restrict handle" "const char * restrict symbol"
-.Ft const char *
+.Ft char *
 .Fn dlerror "void"
 .Ft int
 .Fn dlclose "void *handle"

libexec/rtld-elf/rtld.c

@@ -1961,7 +1961,7 @@ dlclose(void *handle)
     return 0;
 }
 
-const char *
+char *
 dlerror(void)
 {
     char *msg = error_message;