feat(hermit): forward log-target feature

Author: mkroening

hermit/Cargo.toml

@@ -43,6 +43,7 @@ fs = []
 fsgsbase = []
 gem-net = []
 idle-poll = []
+log-target = []
 
 # Build the kernel with function instrument code for mcount-based tracing
 instrument = []

hermit/build.rs

@@ -121,6 +121,7 @@ impl KernelSrc {
 				"fsgsbase",
 				"gem-net",
 				"idle-poll",
+				"log-target",
 				"mmap",
 				"pci",
 				"pci-ids",