Do not build DPH when GhcProfiled (fixes #4172)

Reason: DPH uses Template Haskell and TH doesn't work 
in a profiled compiler

ghc.mk

@@ -345,6 +345,10 @@ $(eval $(call addPackage,haskeline))
 $(foreach pkg,$(EXTRA_PACKAGES),$(eval $(call addPackage,$(pkg))))
 
 ifneq "$(BootingFromHc)" "YES"
+
+ifneq "$(GhcProfiled)" "YES"
+# DPH uses Template Haskell, and Template Haskell doesn't work
+# with a profiled compiler. So if stage-2 is profile, don't build DPH
 PACKAGES_STAGE2 += \
 	dph/dph-base \
 	dph/dph-prim-interface \
@@ -353,6 +357,7 @@ PACKAGES_STAGE2 += \
 	dph/dph-seq \
 	dph/dph-par
 endif
+endif
 
 # We assume that the stage0 compiler has a suitable bytestring package,
 # so we don't have to include it below.