Remove autotools files and update INSTALL file

test/makefile.am

@@ -1,4 +0,0 @@
-SUBDIRS = test-input
-if OS_WIN
-SUBDIRS += win
-endif

test/test-input/makefile.am

@@ -1,23 +0,0 @@
-AM_CFLAGS = -isystem$(top_srcdir)/libobs
-
-if OS_WIN
-if ARCH_X86
-libtestdir = ../../build/plugins/32bit
-else
-libtestdir = ../../build/plugins/64bit
-endif
-else
-libtestdir = $(libdir)/obs-plugins
-endif
-
-libtest_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 \
-			   test-sinewave.c

test/win/makefile.am

@@ -1,8 +0,0 @@
-INCLUDES = -isystem$(top_srcdir)/libobs
-AM_CPPFLAGS = -DUNICODE -D_UNICODE
-
-builddir = ../../build
-build_PROGRAMS = test
-test_LDADD = $(top_srcdir)/libobs/libobs.la
-test_LDFLAGS = -mwindows
-test_SOURCES = test.cpp