lib/float+.h is already under LGPLv2+ since 2007-07-13, per
modules/vasnprintf.
Paolo Bonzini's approval for lib/frexp.c and lib/frexpl.c is in
http://lists.gnu.org/archive/html/bug-gnulib/2016-11/msg00074.html.
All other significant changes to the files in lib/ of these modules
are from me.
* modules/memcmp2 (License): Change to LGPLv2+.
* modules/amemxfrm (License): Likewise.
* modules/fpieee (License): Likewise.
* modules/fpucw (License): Likewise.
* modules/frexp-nolibm (License): Likewise.
* modules/frexpl-nolibm (License): Likewise.
* modules/printf-frexp (License): Likewise.
* modules/printf-frexpl (License): Likewise.
* modules/printf-safe (License): Likewise.
* modules/signbit (License): Likewise.