dev-libs/gmp: add USE=pic for static libraries, bug #707332
gmp makes a decision to use PIC or non-PIC assemply at
./configure time instead of (typical) build time.
On top of that non-PIC assembly also has TEXTRELs in it
which musl can't handle and crashes binaries at relocation
setup time. For gmp is it relevant only for static linking.
The change adds USE=pic to force static libraries to generate
assembly code without TEXTRELs.
Reported-by: Andrew Aladjev
Closes: https://bugs.gentoo.org/707332
Package-Manager: Portage-2.3.86, Repoman-2.3.20
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>