refactor: replace OSError aliases

[theguy147]

refactor: replace OSError aliases

Description/Motivation/Screenshots

As Part of PEP 3151 (Python3.3) several error classes have been merged into OSError and have then been aliased to OSError. This PR replaces the aliases.

How Has This Been Tested?

Architecture	Yes/No	Comments
x86-32	✔️
x86-64	✔️
ARM	✖️
AARCH64	✖️
MIPS	✖️
POWERPC	✖️
SPARC	✖️
RISC-V	✖️
make test	✖️	test_cmd_elf_info already failed on this branch before this PR

Checklist

• My PR was done against the gdb_8_py36_code_refactor branch, not master.
• My code follows the code style of this project.
• My change includes a change to the documentation, if required.
• My change adds tests as appropriate.
• I have read and agree to the CONTRIBUTING document.