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sig_return: Solaris/OSX returns different function ptr
Move defination to my_alarm.h as its the only use.

prevents compile warnings (copied from 10.3 branch)

mysys/my_sync.c:136:19: error: 'cur_dir_name' defined but not used [-Werror=unused-const-variable=]
  136 | static const char cur_dir_name[]= {FN_CURLIB, 0};
      |                   ^~~~~~~~~~~~

fix compile error (DEPRECATED) leaked from ssl headers.

In file included from /export/home/dan/mariadb-server-10.4/sql/sys_vars.cc:37:
/export/home/dan/mariadb-server-10.4/sql/sys_vars.ic:69: error: "DEPRECATED" redefined [-Werror]
   69 | #define DEPRECATED(X) X
      |
In file included from /export/home/dan/mariadb-server-10.4/include/violite.h:150,
                 from /export/home/dan/mariadb-server-10.4/sql/sql_class.h:38,
                 from /export/home/dan/mariadb-server-10.4/sql/sys_vars.cc:36:
/usr/include/openssl/ssl.h:2356: note: this is the location of the previous definition
 2356 | # define...