Done using this command (also includes .c.in and .h.in files):
for i in $(g ls-files|grep -E '\.[ch](\.in)?$'|grep -v gnulib); do
  expand -i $i > j && mv j $i;done

* build-aux/useless-if-before-free: Rename from ...
* build-aux/find-unnecessary-if-before-free: ... this.  Remove file.
Also changed it so that new names are no longer hard-coded in the
script.  Instead, they're supplied via options:
* Makefile.cfg (useless_free_options): Define.
Add xmlXPathFreeObject to the list of free-like functions it detects.
* Makefile.maint (sc_avoid_if_before_free): Reflect script renaming.
* .x-sc_avoid_if_before_free: Likewise.
* src/openvz_conf.c (openvzParseXML): Remove useless "if"-before-free.
* src/qemu_conf.c (qemudParseXML, qemudParseNetworkXML): Likewise.
* src/virsh.c (cmdVNCDisplay, cmdTTYConsole, cmdDetachInterface):
(cmdDetachDisk): Likewise.
* src/xm_internal.c (xenXMConfigSetIntFromXPath): Likewise.
(xenXMConfigSetStringFromXPath, xenXMParseXMLToConfig): Likewise.
(xenXMDomainAttachDevice, xenXMAttachDisk, xenXMAttachInterface):
(xenXMDomainDetachDevice): Likewise.
* src/xml.c (virXPathString): Likewise.
* tests/xmlrpctest.c (checkRequestValue): Likewise.

* Makefile.cfg (local-checks-to-skip): Remove sc_trailing_blank.
* .x-sc_trailing_blank: New file, to exempt the few binary files.

* build-aux/find-unnecessary-if-before-free: Update regexp.
* src/openvz_conf.c: Remove unnecessary "if (P)"-before xmlXPathFreeContext.
* src/qemu_conf.c: Likewise.
* src/virsh.c: Likewise.
* src/xm_internal.c: Likewise.
* src/xml.c: Likewise.
* tests/xmlrpctest.c: Likewise.

Use <config.h>, not "config.h", per autoconf documentation.
* Makefile.cfg (local-checks-to-skip) [sc_require_config_h]: Enable.
* .x-sc_require_config_h: New file, to list exempted files.
* Makefile.am (EXTRA_DIST): Add .x-sc_require_config_h.

* qemud/event.c: Likewise.
* src/buf.c: Likewise.
* src/hash.c: Likewise.
* src/nodeinfo.c: Likewise.
* src/openvz_conf.c: Likewise.
* src/proxy_internal.c: Likewise.
* src/virterror.c: Likewise.
* src/xmlrpc.c: Likewise.
* src/xs_internal.c: Likewise.
* tests/conftest.c: Likewise.
* tests/xmlrpctest.c: Likewise.
This fixes a mingw build failure reported by Rich Jones.

Author: Jim Meyering <meyering@redhat.com>

  include/libvirt/virterror.h python/generator.py python/libvir.c
  python/libvirt_wrap.h src/driver.h src/internal.h src/test.h
  src/virsh.c src/virterror.c src/xend_internal.c src/xend_internal.h
  src/xml.c src/xml.h: moved the includes from include/ to
  include/libvirt to reflect the installed include tree. This
  avoid using "" in the includes themselves.
Daniel