pidgin/pidgin

remove the glib version macros from internal.h to meson and make sure everything is consistent

2021-10-28, Gary Kramlich
b60171ce4589
remove the glib version macros from internal.h to meson and make sure everything is consistent

Testing Done:
Compiled and ran the unit tests.

Reviewed at https://reviews.imfreedom.org/r/1111/
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