configure: also add EXTRA_PREFIX to {CPP/LD}FLAGS

The path provided by EXTRA_PREFIX should be added to the search path
of the configure script, like it's done in Config.mk. Not doing so
makes the search path for configure differ from the search path used
by the build.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
[ wei: run autogen.sh ]
Acked-by: Wei Liu <wl@xen.org>

m4/set_cflags_ldflags.m4

@@ -15,6 +15,10 @@ for ldflag in $APPEND_LIB
 do
     APPEND_LDFLAGS="$APPEND_LDFLAGS -L$ldflag"
 done
+if [ ! -z $EXTRA_PREFIX ]; then
+    CPPFLAGS="$CPPFLAGS -I$EXTRA_PREFIX/include"
+    LDFLAGS="$LDFLAGS -L$EXTRA_PREFIX/lib"
+fi
 CPPFLAGS="$PREPEND_CPPFLAGS $CPPFLAGS $APPEND_CPPFLAGS"
 LDFLAGS="$PREPEND_LDFLAGS $LDFLAGS $APPEND_LDFLAGS"])
 

tools/configure

@@ -4678,6 +4678,10 @@ for ldflag in $APPEND_LIB
 do
     APPEND_LDFLAGS="$APPEND_LDFLAGS -L$ldflag"
 done
+if  ! -z $EXTRA_PREFIX ; then
+    CPPFLAGS="$CPPFLAGS -I$EXTRA_PREFIX/include"
+    LDFLAGS="$LDFLAGS -L$EXTRA_PREFIX/lib"
+fi
 CPPFLAGS="$PREPEND_CPPFLAGS $CPPFLAGS $APPEND_CPPFLAGS"
 LDFLAGS="$PREPEND_LDFLAGS $LDFLAGS $APPEND_LDFLAGS"