Enable verbose mode when building.

Don't regenerate rdoc documentation during install.

Index: common.mk
--- common.mk.orig
+++ common.mk
@@ -7,7 +7,7 @@ dll: $(LIBRUBY_SO)
 .SUFFIXES: .rbinc .rb .inc .h .c .y .i .$(ASMEXT) .$(DTRACE_EXT)
 
 # V=0 quiet, V=1 verbose.  other values don't work.
-V = 0
+V = 1
 V0 = $(V:0=)
 Q1 = $(V:1=)
 Q = $(Q1:0=@)
@@ -303,7 +303,7 @@ ext/configure-ext.mk: $(PREP) all-incs $(MKFILES) $(RB
 configure-ext: $(EXTS_MK)
 
 build-ext: $(EXTS_MK)
-	$(Q)$(MAKE) -f $(EXTS_MK) $(mflags) libdir="$(libdir)" LIBRUBY_EXTS=$(LIBRUBY_EXTS) \
+	$(Q)$(MAKE) -f $(EXTS_MK) V=1 $(mflags) libdir="$(libdir)" LIBRUBY_EXTS=$(LIBRUBY_EXTS) \
 	    EXTENCS="$(ENCOBJS)" MINIRUBY="$(MINIRUBY)" UPDATE_LIBRARIES=no $(EXTSTATIC)
 	$(Q)$(MAKE) $(EXTS_NOTE)
 
@@ -547,7 +547,7 @@ dont-install-man: $(PREP)
 post-no-install-man::
 	@$(NULLCMD)
 
-install-doc: rdoc pre-install-doc do-install-doc post-install-doc
+install-doc: pre-install-doc do-install-doc post-install-doc
 pre-install-doc:: install-prereq
 do-install-doc: $(PROGRAM) pre-install-doc
 	$(INSTRUBY) --make="$(MAKE)" $(INSTRUBY_ARGS) --install=rdoc $(INSTALL_DOC_OPTS)