The CONTRIBUTING.md requests an (or multiple) SPDX identifier for GPL
licenses. But a lot of packages did use a different, non-SPDX style with a
"+" at the end instead of "-or-later".

Signed-off-by: Sven Eckelmann <sven@narfation.org>

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

This requires a +.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libp11 uses OpenSSL's ENGINE quite extensively with seemingly no simple
way to disable it. Add it as a dependency.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Reorganized Makefile a little bit for consistency with other packages.

Added PKG_BUILD_PARALLEL for faster compilation.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Fix the following compilation error

    In file included from openconnect-internal.h:95:0,
		     from ssl.c:41:
    /home/yousong/git-repo/lede-project/lede/staging_dir/target-mips_24kc_musl/usr/include/libp11.h: At top level:
    /home/yousong/git-repo/lede-project/lede/staging_dir/target-mips_24kc_musl/usr/include/libp11.h:27:21: fatal error: p11_err.h: No such file or directory
    compilation terminated.
    make[5]: *** [libopenconnect_la-ssl.lo] Error 1

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

libp11 is a PKCS#11 wrapper library

Signed-off-by: Daniel Golle <daniel@makrotopia.org>