Bug 754617 - Gnucash should use PKG_PROG_PKG_CONFIG

Actually we already do, making this fragment unnecessary. What's more
Ximian Desktop is long gone so the work-around is redundant as well.

configure.ac

@@ -253,18 +253,6 @@ AM_CONDITIONAL(GNUCASH_SEPARATE_BUILDDIR, test "x${srcdir}" != "x.")
 # Init binreloc
 AM_BINRELOC
 
-### --------------------------------------------------------------------------
-### See if we have pkg-config
-
-AC_PATH_PROG(PKG_CONFIG,pkg-config)
-if test "x$PKG_CONFIG" = x; then
-  # @*%&$ Ximian programmers renamed this application
-  AC_PATH_PROG(PKG_CONFIG,pkgconfig)
-  if test "x$PKG_CONFIG" = x; then
-    AC_MSG_ERROR([Could not find the pkg-config (or pkgconfig) program.],)
-  fi
-fi
-
 ### --------------------------------------------------------------------------
 ### Glib checks.