speedo,w32: configure --libdir for w32 builds

* build-aux/speedo.mk (SETVARS): Set --libdir when cross
compiling.

--
This ensures that the libdir is reliably named "lib" instead
of lib64 for 64 bit builds on systems which have this as
the default. This fixes among other things that PKG_CONFIG_PATH
is then set correctly.

build-aux/speedo.mk

@@ -765,6 +765,9 @@ define SETVARS
         fi;                                                             \
         pkgbdir="$(bdir)/$(1)";                                         \
         pkgcfg="$(call GETVAR,speedo_pkg_$(1)_configure)";              \
+        if [ "$(TARGETOS)" != native ]; then                            \
+          pkgcfg="$(pkgcfg) --libdir=$(idir)/lib";                      \
+        fi;                                                             \
         tmp="$(speedo_w32_cflags)                                       \
              $(call GETVAR,speedo_pkg_$(1)_extracflags)";               \
         if [ x$$$$(echo "$$$$tmp" | tr -d '[:space:]')x != xx ]; then   \