bfd: Support dynamic expansion for massively long text lines #280

Job	Run time
Alpine Test (ubuntu-22.04, GCC=1)	6m 3s
Alpine Test (ubuntu-22.04, CLANG=1)	6m 1s
compat-test	1s
nftables-test	1s
aarch64-test	1s
podman-test	1s
matrix.name	1s
cross-compile	1s
java-test	1s
gcov-test	1s
fedora-asan-test	1s
x86-64-clang-test	1s
docker-test	1s
Vagrant Fedora Rawhide based test	1s
Alpine Test ARM64	1s
stream-test	1s
archlinux-test	1s
x86-64-gcc-test	1s
loongarch64-qemu-test	1s
	12m 21s

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