frr: fix host build error on macOS
Fixes:
lib/command_graph.c:16:1: error: argument to 'section' attribute is not valid for this target: mach-o section specifier requires a segment and section separated by a comma DEFINE_MTYPE_STATIC(LIB, CMD_TOKENS, "Command Tokens"); ^
./lib/memory.h:139:2: note: expanded from macro 'DEFINE_MTYPE_STATIC'
DEFINE_MTYPE_ATTR(group, name, static, desc) \
^
./lib/memory.h:109:26: note: expanded from macro 'DEFINE_MTYPE_ATTR'
__attribute__((section(".data.mtypes"))) = { { \
[1] https://github.com/FRRouting/frr/pull/6032
[2] https://github.com/FRRouting/frr/pull/15890
Signed-off-by: Georgi Valkov <gvalkov@gmail.com>