libpbc: add new package

cherry-pick commit 4c5d25458 libpbc: add new package
from master as GNUnet started to depend on libgabe which depends on
libpbc.

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

libs/libpbc/Makefile

@@ -0,0 +1,49 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=libpbc
+PKG_VERSION:=0.5.14
+PKG_RELEASE:=1
+PKG_HASH:=772527404117587560080241cedaf441e5cac3269009cdde4c588a1dce4c23d2
+
+PKG_SOURCE:=pbc-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://crypto.stanford.edu/pbc/files/
+PKG_BUILD_DIR:=$(BUILD_DIR)/pbc-$(PKG_VERSION)
+PKG_INSTALL:=1
+
+PKG_MAINTAINER:=Daniel Golle <daniel@makrotopia.org>
+PKG_LICENSE:=LGPL-3.0+
+PKG_LICENSE_FILES:=COPYING
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/libpbc
+  SECTION:=libs
+  CATEGORY:=Libraries
+  TITLE:=The Pairing-Based Cryptography Library
+  URL:=https://crypto.stanford.edu/pbc/
+  DEPENDS:=+libgmp
+endef
+
+define Package/libpbc/description
+  Pairing-based cryptography is a relatively young area of cryptography
+  that revolves around a certain function with special properties.
+
+  The PBC (Pairing-Based Cryptography) library is a free C library
+  (released under the GNU Lesser General Public License) built on the GMP
+  library that performs the mathematical operations underlying
+  pairing-based cryptosystems.
+endef
+
+define Build/InstallDev
+	$(INSTALL_DIR) $(1)/usr/include/pbc
+	$(CP) $(PKG_INSTALL_DIR)/usr/include/pbc/*.h $(1)/usr/include/pbc
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libpbc* $(1)/usr/lib/
+endef
+
+define Package/libpbc/install
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libpbc.so.*  $(1)/usr/lib/
+endef
+
+$(eval $(call BuildPackage,libpbc))