AVR: target/120442 - Support f7_fdim / fdiml in LibF7. Add Support for fdiml. PR target/120442 libgcc/config/avr/libf7/ * libf7-common.mk (LIBF_C_PARTS, m_ddd): Add fdim. * libf7.h (f7_fdim): New proto. * libf7.c (f7_fdim): New function. * f7renames.sh (f7_fdim): Add rename. * f7-wraps.h: Rebuild * f7-renames.h: Rebuild (cherry picked from commit 6045de6596d09f3cf7ae3f552b56d7e5df17a899)