Custom types in target description XMLs

[Shahab Vahedi]

For the record, this problem was reported under PR28103 [1] and
PR28104 [2].

It has been resolved by the following patches in master and
gdb-11-branch:

   gdb: Fix numerical field extraction for target ... [3][4]
   gdb: Make the builtin "boolean" type an unsigned type [5][6]


Cheers,
Shahab

[1] Incorrect extraction of integer fields in target description...
https://sourceware.org/PR28103

[2] Incorrect extraction of boolean fields in target description...
https://sourceware.org/PR28104

[3] [master] gdb: Fix numerical field extraction for target...
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=c9bd985

[4] [gdb-11] gdb: Fix numerical field extraction for target...
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=70417f2

[5] [master] gdb: Make the builtin "boolean" type an unsigned type
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=91254b9

[6] [gdb-11] gdb: Make the builtin "boolean" type an unsigned type
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=e4c1aea