buildroot

gnupg2: drop non-wchar toolchain workaround

gnupg2 removed gnulib in version 2.1.1. The workaround for non-wchar
toolchains introduced in commit 8a878870958 (gnupg2: fix build on
non-wchar toolchains), is no longer needed.

Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Romain Naour <romain.naour@openwide.fr>
Cc: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>