builld: allow out of source build * Makefile.in: add TOP_BUILD_DIR var and use TOP_DIR=srcdir, TOP_BUILD_DIR=builddir, modify paths to use TOP_DIR where needed * binary-dist-rules.mk: use TOP_DIR and TOP_BUILD_DIR where needed * makeinst-script.sh: use script path to determine TOPDIR, use TOPDIR where needed * src/default-octave.mk: install octave-version to builddir * src/stable-octave.mk: install octave-version to builddir * src/octave.mk: install octave-version to builddir * tools/set-mxe-env.sh.in: update fir builddir and srcdir use

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diff -urN mman-win32-master/Makefile mman-win32-master-patch/Makefile
--- mman-win32-master/Makefile	2013-04-23 07:36:23.000000000 +0300
+++ mman-win32-master-patch/Makefile	2014-01-05 14:24:31.793744239 +0200
@@ -25,7 +25,7 @@
 	mkdir -p $(DESTDIR)$(libdir)
 	cp libmman.a $(DESTDIR)$(libdir)
 	mkdir -p $(DESTDIR)$(incdir)
-	cp mman.h $(DESTDIR)$(incdir)
+	cp mman.h $(DESTDIR)$(incdir)/mman-win32.h
 
 lib-install:
 	mkdir -p $(DESTDIR)$(libdir)