Jamfile/makefile-engines:replace -nostart with -shared

Starting from our GCC 4.7.3 the shared library -nostart option is not
valid anymore. Replace it with -shared one that works in GCC2 build
environment too.

data/develop/makefile-engine

@@ -93,7 +93,7 @@ endif
 		LDFLAGS += -Xlinker -soname=_APP_
 	else
 	ifeq ($(strip $(TYPE)), SHARED)
-		LDFLAGS += -nostart -Xlinker -soname=$(NAME)
+		LDFLAGS += -shared -Xlinker -soname=$(NAME)
 	else
 	ifeq ($(strip $(TYPE)), DRIVER)
 		LDFLAGS += -nostdlib /boot/develop/lib/x86/_KERNEL_ \