fix BUILDDIR <> SRCDIR in makefiles

Change-Id: I7b6cc6b638cec5e552492548a878325b3fe1119d

Makefile.build

@@ -7,7 +7,9 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 #
 
+ifeq (,$(SOLARENV))
 include $(dir $(realpath $(firstword $(MAKEFILE_LIST))))config_host.mk
+endif
 
 gb_Side := host
 include $(SOLARENV)/gbuild/gbuild.mk

Makefile.cross

@@ -7,7 +7,7 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 #
 
-include $(dir $(realpath $(firstword $(MAKEFILE_LIST))))config_build.mk
+include $(BUILDDIR)/config_build.mk
 
 gb_Side := build
 include $(SOLARENV)/gbuild/gbuild.mk

Makefile.in

@@ -126,11 +126,11 @@ distclean : clean compilerplugins-clean
         $(BUILDDIR)/config_host.mk \
         $(BUILDDIR)/config_host.mk.stamp \
         $(BUILDDIR)/config_host/*.h \
+        $(BUILDDIR)/config_host/*.mk \
         $(BUILDDIR)/configure \
         $(BUILDDIR)/instsetoo_native/util/openoffice.lst \
         $(BUILDDIR)/lo.xcent \
-        $(BUILDDIR)/solenv/inc/minor.mk \
-        $(BUILDDIR)/warn
+        $(BUILDDIR)/solenv/inc/minor.mk
 	find $(SOLARENV)/gdb -name "*.pyc" -exec rm {} \;
 
 #