Fixed CentOS 7 install guide is missing some packages

[felicia22]

Linked issues

https://github.com/AcademySoftwareFoundation/OpenRV/issues/581

Summarize your change.

added installation for ninja-build, meson, and tcsh packages

Describe the reason for the change.

Need the packages to run OpenRV

Describe what you have tested and on which operating system.

MacOS

[linux-foundation-easycla[bot]]

• :white_check_mark: login: felicia22 (2d1907cfa919229c06e937ab2f24cfa0764ffd6b, 9b361691422fa150fd4883a7bc87f19fb0079e25, 9e61ea2467b12385ecae891f4837fc2ce4abf0ba, 3f44106d5ce30ba000c4b91eb86d7bf10baef48e, d90f401e52a210f7fd3062b2b43c9556d012f00e)
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[pbergeron-adsk]

Hi @felicia22 Unfortunately, since CentOS 7 is end-of-life'd, we will no longer supporting this setup moving forward.