Revert "libc: counting, rounding, and min/max macros"

This reverts commit 2520a2835397a24ea18b9a493986fc101d2703ba.
Revert "[ARM] libc: define return and conditional return macros"

This reverts commit eadb8f3f6222d6d41a6d27cc634d94f2eb6be18a.
Revert "libm: add fmal long double stub"

This reverts commit 8a0260a585f2001245b74970fc983331e43d88f0.