gpgme: install gpgme-config to host bin

This is necessary for at least fwknop to properly detect the library.

The change was modeled after how gpg-error-config is installed in the
libgpg-error package.

Signed-off-by: Matt Merhar <mattmerhar@protonmail.com>

libs/gpgme/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=gpgme
 PKG_VERSION:=1.15.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://gnupg.org/ftp/gcrypt/$(PKG_NAME)
@@ -83,6 +83,15 @@ define Build/InstallDev
 	$(INSTALL_DATA) \
 		$(PKG_INSTALL_DIR)/usr/lib/cmake/Gpgmepp/*.cmake \
 		$(1)/usr/lib/cmake/Gpgmepp
+
+	$(INSTALL_DIR) $(2)/bin $(1)/usr/bin
+	$(INSTALL_BIN) \
+		$(PKG_INSTALL_DIR)/usr/bin/gpgme-config \
+		$(2)/bin/
+	$(SED) \
+		's,^\(prefix\|exec_prefix\)=.*,\1=$(STAGING_DIR)/usr,g' \
+		$(2)/bin/gpgme-config
+	$(LN) -sf $(STAGING_DIR)/host/bin/gpgme-config $(1)/usr/bin/gpgme-config
 endef
 
 define Package/libgpgme/install