Fix DSO name on HP/UX

If dlfcn is used, the name was set to lib$(LIBNAME).so when it should
have been just $(LIBNAME).so.

Reviewed-by: Andy Polyakov <appro@openssl.org>

Makefile.shared

diff --git a/Makefile.shared b/Makefile.shared
index 2617fbf..313de4e 100644
--- a/Makefile.shared
+++ b/Makefile.shared
@@ -489,7 +489,7 @@
 link_dso.hpux:
 	@if $(DETECT_GNU_LD); then $(DO_GNU_DSO); else \
 	SHLIB=$(LIBNAME).sl; \
-	expr "$(CFLAGS)" : '.*DSO_DLFCN' > /dev/null && SHLIB=lib$(LIBNAME).so; \
+	expr "$(CFLAGS)" : '.*DSO_DLFCN' > /dev/null && SHLIB=$(LIBNAME).so; \
 	SHLIB_SUFFIX=; \
 	ALLSYMSFLAGS=''; \
 	NOALLSYMSFLAGS=''; \