PicoJava weak undefined symbols

This fixes the recently added ld-elf/pr24511 test failure on pj-elf.
Incidentally, pj-elf has failed its gas "pj" test since 2005-12-22
(git commit 54758c3e39).  I think that makes the target ripe for
obsolescence.

bfd/
	* elf32-pj.c (pj_elf_reloc): Don't report undefined weak as an error.
ld/
	* testsuite/ld-undefined/weak-undef.exp: Don't xfail pj.

bfd/ChangeLog

@@ -1,3 +1,7 @@
+2019-05-06  Alan Modra  <amodra@gmail.com>
+
+	* elf32-pj.c (pj_elf_reloc): Don't report undefined weak as an error.
+
 2019-05-06  Alan Modra  <amodra@gmail.com>
 
 	* reloc.c (BFD_RELOC_PPC64_TPREL16_HIGH, BFD_RELOC_PPC64_TPREL16_HIGHA),

bfd/elf32-pj.c

@@ -54,6 +54,7 @@ pj_elf_reloc (bfd *abfd,
     }
 
   if (symbol_in != NULL
+      && (symbol_in->flags & BSF_WEAK) == 0
       && bfd_is_und_section (symbol_in->section))
     return bfd_reloc_undefined;
 

ld/ChangeLog

@@ -1,3 +1,7 @@
+2019-05-06  Alan Modra  <amodra@gmail.com>
+
+	* testsuite/ld-undefined/weak-undef.exp: Don't xfail pj.
+
 2019-05-04  Alan Modra  <amodra@gmail.com>
 
 	* testsuite/ld-scripts/fill.d: Don't xfail m32c

ld/testsuite/ld-undefined/weak-undef.exp

@@ -35,7 +35,6 @@ if { ![is_elf_format] && ![is_pecoff_format] } then {
     if {! [istarget i?86-*-*]} {
 	setup_xfail *-*-pe*
     }
-    setup_xfail pj-*-*
     fail $testname
 } elseif {![is_remote host] && [which $objdump] == 0} then {
     unresolved $testname