docs/: ignore gtester Makefile targets

Mark 'test', 'test-report', 'perf-report' and 'full-report' as PHONY in
docs/Makefile.am to prevent recursion of gtester into the documentation
subdirectories.  Stop including Makefile.decl from these directories
since it is no longer necessary.

This will clear up the warnings about EXTRA_DIST being defined once in
gtk-doc.make and again in Makefile.decl.

docs/Makefile.am

@@ -1,11 +1,12 @@
 ## Process this file with automake to produce Makefile.in
-include $(top_srcdir)/Makefile.decl
 
 SUBDIRS = reference
 
-EXTRA_DIST += debugging.txt macros.txt
+EXTRA_DIST = debugging.txt macros.txt
 
 files:
 	@files=`ls $(DISTFILES) 2> /dev/null `; for p in $$files; do \
 	  echo $$p; \
 	done
+
+.PHONY: test test-report perf-report full-report

docs/reference/Makefile.am

@@ -1,3 +1 @@
-include $(top_srcdir)/Makefile.decl
-
 SUBDIRS = glib gobject gio

docs/reference/gio/Makefile.am

@@ -1,4 +1,3 @@
-include $(top_srcdir)/Makefile.decl
 NULL =
 
 SUBDIRS = gdbus-object-manager-example

docs/reference/gio/gdbus-object-manager-example/Makefile.am

@@ -1,4 +1,3 @@
-include $(top_srcdir)/Makefile.decl
 NULL =
 
 # The name of the module.

docs/reference/glib/Makefile.am

@@ -1,5 +1,4 @@
 ## Process this file with automake to produce Makefile.in
-include $(top_srcdir)/Makefile.decl
 
 AUTOMAKE_OPTIONS = 1.6
 

docs/reference/gobject/Makefile.am

@@ -1,5 +1,4 @@
 ## Process this file with automake to produce Makefile.in
-include $(top_srcdir)/Makefile.decl
 
 AUTOMAKE_OPTIONS = 1.6