remove Makefile.am from public headers (no build systems in shared repos)

Makefile.am

@@ -1,19 +0,0 @@
-MAINTAINERCLEANFILES = Makefile.in
-
-libjackincludedir = $(includedir)/jack
-
-libjackinclude_HEADERS = 	\
-	intclient.h		\
-	jack.h			\
-	ringbuffer.h		\
-	statistics.h            \
-	session.h               \
-	thread.h                \
-	timestamps.h		\
-	transport.h		\
-	types.h	                \
-	midiport.h              \
-	weakmacros.h            \
-	weakjack.h              \
-	control.h		\
-	jslist.h