libap: Add library for ap / vfio-ap management tools

libap is intended to provide utility functions to be used by
tooling supporting the ap bus and vfio-ap mediated devices.

Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

libap/Makefile

@@ -0,0 +1,37 @@
+include ../common.mak
+
+lib = libap.a
+
+check-dep-lock:
+	touch check-dep-lock
+ifneq (${HAVE_LOCKFILE},0)
+	$(call check_dep, \
+		"libap", \
+		"lockfile.h", \
+		"liblockfile-devel", \
+		"HAVE_LOCKFILE=0")
+ALL_CPPFLAGS += -DHAVE_LOCKFILE
+endif
+
+check-dep-json:
+	touch check-dep-json
+ifneq (${HAVE_JSONC},0)
+	$(call check_dep, \
+		"libap", \
+		"json-c/json.h", \
+		"json-c-devel", \
+		"HAVE_JSONC=0")
+ALL_CPPFLAGS += -DHAVE_JSONC
+endif
+
+all: $(lib)
+objects = ap.o
+
+$(lib): $(objects)
+
+$(objects): check-dep-lock check-dep-json
+
+install: all
+
+clean:
+	rm -f *.o check-dep-lock check-dep-json $(lib)