Subject: Support build profile skip/libnspr4-dbg

Index: nspr-4.12/debian/rules
===================================================================
--- nspr-4.12.orig/debian/rules	2018-03-18 20:18:31.000000000 +0100
+++ nspr-4.12/debian/rules	2018-03-18 20:21:12.000000000 +0100
@@ -69,8 +69,12 @@
 		sed -i '2!b;/^exec "/ d' nspr/build/autoconf/$$file; \
 	done
 
+PACKAGES := $(shell dh_listpackages)
+
+ifneq (,$(filter libnspr4-dbg,$(PACKAGES)))
 override_dh_strip:
 	dh_strip -a --dbg-package=libnspr4-dbg
+endif
 
 override_dh_makeshlibs:
 	dh_makeshlibs -a -- -c4