libgo: fix Stat_t on AIX

    
    Reviewed-on: https://go-review.googlesource.com/59911

From-SVN: r251436

gcc/go/gofrontend/MERGE

-a28f1d8aa306bdb5166af1f087e5f5027ce51d6d
+03a2c6be0c6e2b8ef62a5a424c5518bfb7cce0b9
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/mksysinfo.sh

@@ -462,6 +462,7 @@ fi | sed -e 's/type _stat64/type Stat_t/' \
          -e 's/st_ctim/Ctim/' \
          -e 's/\([^a-zA-Z0-9_]\)_timeval\([^a-zA-Z0-9_]\)/\1Timeval\2/g' \
          -e 's/\([^a-zA-Z0-9_]\)_timespec_t\([^a-zA-Z0-9_]\)/\1Timespec\2/g' \
+         -e 's/\([^a-zA-Z0-9_]\)_st_timespec_t\([^a-zA-Z0-9_]\)/\1Timespec\2/g' \
          -e 's/\([^a-zA-Z0-9_]\)_timespec\([^a-zA-Z0-9_]\)/\1Timespec\2/g' \
          -e 's/\([^a-zA-Z0-9_]\)_timestruc_t\([^a-zA-Z0-9_]\)/\1Timestruc\2/g' \
          -e 's/Godump_[0-9] struct { \([^;]*;\) };/\1/g' \