[Build] Fix breakage when $PATH includes paths with espaces

Author: Rodrigo Moya

Makefile

@@ -53,13 +53,14 @@ CONFIG_MAKE=$(top_srcdir)/config.make
 %-recursive: $(CONFIG_MAKE)
 	@export PKG_CONFIG_PATH="`pwd`/$(top_srcdir)/local-config:$(prefix)/lib/pkgconfig:$(prefix)/share/pkgconfig:$$PKG_CONFIG_PATH"; \
 	export MONO_GAC_PREFIX="$(prefix):$$MONO_GAC_PREFIX"; \
+	export PATH="$$PATH:/Library/Frameworks/Mono.framework/Versions/Current/bin"; \
 	set . $$MAKEFLAGS; final_exit=:; \
 	case $$2 in --unix) shift ;; esac; \
 	case $$2 in *=*) dk="exit 1" ;; *k*) dk=: ;; *) dk="exit 1" ;; esac; \
 	for dir in $(SUBDIRS); do \
 		case $$dir in \
-		.) PATH="$(PATH):/Library/Frameworks/Mono.framework/Versions/Current/bin" $(MAKE) $*-local || { final_exit="exit 1"; $$dk; };;\
-		*) (cd $$dir && PATH="$(PATH):/Library/Frameworks/Mono.framework/Versions/Current/bin" $(MAKE) $*) || { final_exit="exit 1"; $$dk; };;\
+		.) $(MAKE) $*-local || { final_exit="exit 1"; $$dk; };;\
+		*) (cd $$dir && $(MAKE) $*) || { final_exit="exit 1"; $$dk; };;\
 		esac \
 	done
 	$$final_exit