Add -DPKGLIBDIR to AM_CPPFLAGS.

This is required so the OpenULINK driver knows the install location of the OpenULINK
firmware image.

common.mk

@@ -2,7 +2,8 @@
 # common flags used in openocd build
 AM_CPPFLAGS = -I$(top_srcdir)/src \
 			  -I$(top_builddir)/src \
-			  -DPKGDATADIR=\"$(pkgdatadir)\"
+			  -DPKGDATADIR=\"$(pkgdatadir)\" \
+			  -DPKGLIBDIR=\"$(pkglibdir)\"
 
 if INTERNAL_JIMTCL
 AM_CPPFLAGS += -I$(top_srcdir)/jimtcl \