The php7-mod-gd package requires that freetype support exist in libgd. The
libgd-full package provides this, whereas the libgd package does only
if explicitly configured.

Ref: https://github.com/openwrt/packages/issues/10944
Signed-off-by: W. Michael Petullo <mike@flyn.org>
Signed-off-by: Michael Heimpold <mhei@heimpold.de>