configure.ac: break 2 on lds directory search
configure.ac: break 2 on lds directory search

To get out of the for loops, to search for the lds directories, break 2

trilean/gummiboot,freedesktop-unofficial-mirror/gummiboot,FrozenCow/gummiboot,miguelinux/gummiboot2systemd-boot,FrozenCow/gummiboot,liliang365/my_gummiboot,miguelinux/gummiboot2systemd-boot,todorez/gummiboot-multiboot2,todorez/gummiboot-multiboot2,aaronp24/gummiboot,aaronp24/gummiboot,todorez/tummiboot,freedesktop-unofficial-mirror/gummiboot,todorez/tummiboot,liliang365/my_gummiboot,trilean/gummiboot