GDB server: fix tests following recent commits.
Fixes #276987.  (Philippe Waroquiers, philippe.waroquiers@skynet.be)

* make_local_links
  - disable gdb tests if gdb version < 7
  - disable pic tests if gdb version < 7.1
* nlfork_chain test
  - reduce chain from 20 to 15 to avoid ENOMEM
    on small ARM systems
* main_pic.c
  - put break at line 11 rather than main entry, as ARM gdb
     does not properly show main args till it has started executing.
* passsigalrm.c
  - do not setsa.sa_restorer (obsolete on linux, unknown on darwin)
* mcvabits.vgtest
  - make prereq consistent with other tests
* filter_gdb
  - upgraded filter to new linenr in clean_after_fork.c



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@11853 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/gdbserver_tests/passsigalrm.c b/gdbserver_tests/passsigalrm.c
index c6f1fb5..a625eb6 100644
--- a/gdbserver_tests/passsigalrm.c
+++ b/gdbserver_tests/passsigalrm.c
@@ -15,7 +15,7 @@
    sa.sa_handler = sigalrm_handler;
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = 0;
-   sa.sa_restorer = NULL;
+
    if (sigaction (SIGALRM, &sa, NULL) != 0)
       perror("sigaction");
    if (kill(getpid(), SIGALRM) != 0)