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

# This file is part of MXE.
# See index.html for further information.

This patch has been taken from:
https://issues.apache.org/jira/browse/XERCESC-1951

diff -r a3f28cf10046 xerces-c.pc.in
--- a/xerces-c.pc.in	Mon Nov 29 00:46:50 2010 +0100
+++ b/xerces-c.pc.in	Mon Nov 29 00:58:47 2010 +0100
@@ -7,4 +7,5 @@
 Description: Validating XML parser library for C++
 Version: @VERSION@
 Libs: -L${libdir} -lxerces-c
+Libs.private: @CURL_LIBS@
 Cflags: -I${includedir}