AIX: Consider tbss symbols in ExportImportList

Export `tbss` (thread variable but part of `bss` section) variables, e.g.:

    [125]  m  0x00000010    .tbss    1 extern                   s2n_errno
    [126]  a4 0x00000004      0   0    CM      UL   -   -

Modules/Platform/AIX/ExportImportList

@@ -63,7 +63,7 @@ if test -z "$no_objects"; then
                     V["EXPORTED"]=" export"
                     V["PROTECTED"]=" protected"
                 }
-                /^\[[0-9]+\]\tm +[^ ]+ +\.(text|data|tdata|bss) +[^ ]+ +(extern|weak) +(EXPORTED|PROTECTED| ) / {
+                /^\[[0-9]+\]\tm +[^ ]+ +\.(text|data|tdata|bss|tbss) +[^ ]+ +(extern|weak) +(EXPORTED|PROTECTED| ) / {
                     if (!match($NF,/^(\.|__sinit|__sterm|__[0-9]+__)/)) {
                         print $NF V[$(NF-1)]
                     }