Portability fixes for AIX 4.x

include/my_global.h:
  Don't define _AIX32_CURSES; this breaks AIX 4.3 (maybe others?).  If
  it is needed for some AIX systems which we support, we will need to
  define it conditionally.
ltconfig:
  Under AIX, the -bexpall flag exports all symbols except those which
  start with an underscore.  MySQL needs to export symbols which start
  with an underscore (e.g., _my_b_write), so -bexpall doesn't work.  It
  seems that -qmkshrobj does what we want.

include/my_global.h

@@ -103,7 +103,7 @@
 #ifdef _AIX			/* By soren@t.dk */
 #define _H_STRINGS
 #define _SYS_STREAM_H
-#define _AIX32_CURSES
+/* #define _AIX32_CURSES */	/* XXX: this breaks AIX 4.3.3 (others?). */
 #endif
 
 #ifdef HAVE_BROKEN_SNPRINTF	/* HPUX 10.20 don't have this defined */

ltconfig

@@ -1308,7 +1308,9 @@ else
       hardcode_direct=yes
     fi
     allow_undefined_flag=' ${wl}-berok'
-    archive_cmds="\$CC $shared_flag"' -o $objdir/$soname $libobjs $deplibs $linkopts ${wl}-bexpall ${wl}-bnoentry${allow_undefined_flag}'
+    # -qmkshrobj used to be -bexpall, but MySQL uses symbols which start with
+    # an underscore (e.g., _my_b_write), so -bexpall doesn't work.
+    archive_cmds="\$CC $shared_flag"' -o $objdir/$soname $libobjs $deplibs $linkopts ${wl}-qmkshrobj ${wl}-bnoentry${allow_undefined_flag}'
     archive_expsym_cmds="\$CC $shared_flag"' -o $objdir/$soname $libobjs $deplibs $linkopts ${wl}-bE:$export_symbols ${wl}-bnoentry${allow_undefined_flag}'
     case "$host_os" in aix4.[01]|aix4.[01].*)
       # According to Greg Wooledge, -bexpall is only supported from AIX 4.2 on