Externals: add hidapi

Current master (d17db57b9d4354752e0af42f5f33007a42ef2906) because
Android support was added after the current release (0.8.0-rc1).

Externals/hidapi/mac/.gitignore

@@ -0,0 +1,17 @@
+Debug
+Release
+*.exp
+*.ilk
+*.lib
+*.suo
+*.vcproj.*
+*.ncb
+*.suo
+*.dll
+*.pdb
+*.o
+hidapi-hidtest
+.deps
+.libs
+*.la
+*.lo

Externals/hidapi/mac/Makefile-manual

@@ -0,0 +1,32 @@
+###########################################
+# Simple Makefile for HIDAPI test program
+#
+# Alan Ott
+# Signal 11 Software
+# 2010-07-03
+###########################################
+
+all: hidtest
+
+CC=gcc
+CXX=g++
+COBJS=hid.o
+CPPOBJS=../hidtest/hidtest.o
+OBJS=$(COBJS) $(CPPOBJS)
+CFLAGS+=-I../hidapi -Wall -g -c 
+LIBS=-framework IOKit -framework CoreFoundation
+
+
+hidtest: $(OBJS)
+	g++ -Wall -g $^ $(LIBS) -o hidtest
+
+$(COBJS): %.o: %.c
+	$(CC) $(CFLAGS) $< -o $@
+
+$(CPPOBJS): %.o: %.cpp
+	$(CXX) $(CFLAGS) $< -o $@
+
+clean:
+	rm -f *.o hidtest $(CPPOBJS)
+
+.PHONY: clean

Externals/hidapi/mac/Makefile.am

@@ -0,0 +1,9 @@
+lib_LTLIBRARIES = libhidapi.la
+libhidapi_la_SOURCES = hid.c
+libhidapi_la_LDFLAGS = $(LTLDFLAGS)
+AM_CPPFLAGS = -I$(top_srcdir)/hidapi/
+
+hdrdir = $(includedir)/hidapi
+hdr_HEADERS = $(top_srcdir)/hidapi/hidapi.h
+
+EXTRA_DIST = Makefile-manual