update build system to autotools (finally)

test/test-input/makefile.am

@@ -0,0 +1,13 @@
+INCLUDES = -iquote$(top_srcdir)/libobs
+lib_LTLIBRARIES = libtest-input.la
+
+libtest_input_la_LDFLAGS = -no-undefined
+
+if OS_WIN
+libtest_input_la_LDFLAGS += -avoid-version
+endif
+
+libtest_input_la_LIBADD = $(top_srcdir)/libobs/libobs.la
+libtest_input_la_SOURCES = test-filter.c \
+			   test-input.c \
+			   test-random.c