Move libdl and linker to static NOTICE files.

The libstdc++ directory has no copyright headers, so it was a no-op
anyway.

The interesting part will be switching libc and libm over to genrules...

Test: N/A
Change-Id: Iec92562af40c451fdcb4a7468984878ec5dba2ce
diff --git a/tools/update_notice.sh b/tools/update_notice.sh
index 0b8a106..a309bc2 100755
--- a/tools/update_notice.sh
+++ b/tools/update_notice.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 cd $DIR/..
-./libc/tools/generate-NOTICE.py libc libdl libm linker libstdc++ > libc/NOTICE
+./libc/tools/generate-NOTICE.py libc libm > libc/NOTICE
 
 git diff --exit-code HEAD libc/NOTICE
 exit $?