Revert "compositor: Add public interface support for client-requested idle inhibition"

This reverts commit 689feced3c0022e8f5cce79df0b19cc370de6247.

(Accidental landing)
diff --git a/Makefile.am b/Makefile.am
index 6241fa0..1e63a58 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -176,9 +176,7 @@
 	protocol/relative-pointer-unstable-v1-protocol.c		\
 	protocol/relative-pointer-unstable-v1-server-protocol.h		\
 	protocol/pointer-constraints-unstable-v1-protocol.c		\
-	protocol/pointer-constraints-unstable-v1-server-protocol.h	\
-	protocol/idle-inhibit-unstable-v1-protocol.c	\
-	protocol/idle-inhibit-unstable-v1-server-protocol.h
+	protocol/pointer-constraints-unstable-v1-server-protocol.h
 
 BUILT_SOURCES += $(nodist_libweston_@LIBWESTON_MAJOR@_la_SOURCES)