Apply this diff:

--- a/google3/third_party/libcap/doc/cap_launch.3
+++ b/google3/third_party/libcap/doc/cap_launch.3
@@ -86,7 +86,7 @@ this would be to allocate detail as follows:
    printf("launcher callback set detail to %d\\n", *detail);
    munmap(detail, sizeof(int));
 
-.if
+.fi
 .PP
 Unless modified by the callback function, the launched code will
 execute with the capability and other security context of the
======

Silence these C compilation warnings from clang (-Wunreachable-code):

- libcap/libcap/cap_proc.c:1025
- libcap/progs/capshdoc.h:377

Address these Go vet warnings:

- libcap/cap/file.go:353
  comment on exported var MinExtFlagSize should be of the form "MinExtFlagSize ..."
- libcap/psx/psx.go:11
  comment on exported function Syscall3 should be of the form "Syscall3 ..."
- libcap/psx/psx.go:16
  comment on exported function Syscall6 should be of the form "Syscall6 ..."