Add some -no-user-package-conf flags

Stops user-installed packages breaking the build

aclocal.m4

@@ -1266,7 +1266,7 @@ if test ! -f utils/ghc-pwd/ghc-pwd && test ! -f utils/ghc-pwd/ghc-pwd.exe; then
   rm -f *.hi
   rm -f ghc-pwd
   rm -f ghc-pwd.exe
-  "$WithGhc" -v0 --make ghc-pwd -o ghc-pwd
+  "$WithGhc" -v0 -no-user-package-conf --make ghc-pwd -o ghc-pwd
   cd ../..
 fi
 

rules/package-config.mk

@@ -32,6 +32,7 @@ $1_$2_HC_DEP =
 $1_$2_HC_PKGCONF = -package-conf $$(BOOTSTRAPPING_CONF)
 $1_$2_GHC_PKG_OPTS = --package-conf=$$(BOOTSTRAPPING_CONF)
 $1_$2_CONFIGURE_OPTS += --package-db=$$(TOP)/$$(BOOTSTRAPPING_CONF)
+$1_$2_HC_OPTS += -no-user-package-conf
 ifeq "$(ghc_ge_613)" "YES"
 $1_$2_HC_OPTS += -rtsopts
 endif

utils/ghc-cabal/ghc.mk

@@ -27,6 +27,7 @@ $(GHC_CABAL_DIR)/dist/build/tmp/ghc-cabal$(exeext): $(wildcard libraries/Cabal/D
 
 $(GHC_CABAL_DIR)/dist/build/tmp/ghc-cabal$(exeext): $(GHC_CABAL_DIR)/ghc-cabal.hs | $$(dir $$@)/. bootstrapping/.
 	"$(GHC)" $(SRC_HC_OPTS) --make $(GHC_CABAL_DIR)/ghc-cabal.hs -o $@ \
+	       -no-user-package-conf \
 	       -Wall $(WERROR) \
 	       -DCABAL_VERSION=$(CABAL_VERSION) \
 	       -odir  bootstrapping \

utils/ghc-pkg/ghc.mk

@@ -48,6 +48,7 @@ endif
 # The binary package is not warning-clean, so we need a few -fno-warns here.
 utils/ghc-pkg/dist/build/$(utils/ghc-pkg_dist_PROG)$(exeext): utils/ghc-pkg/Main.hs utils/ghc-pkg/Version.hs $(GHC_CABAL_INPLACE) | bootstrapping/. $$(dir $$@)/.
 	"$(GHC)" $(SRC_HC_OPTS) --make utils/ghc-pkg/Main.hs -o $@ \
+	       -no-user-package-conf \
 	       -Wall -fno-warn-unused-imports \
 	       -DCABAL_VERSION=$(CABAL_VERSION) \
 	       -DBOOTSTRAPPING \