fix ld warning "attempted multiple inclusion of file" on Solaris

- To avoid ld warning on Solaris, use abs_top_builddir in Makefile.am

apps/openssl/Makefile.am

@@ -5,8 +5,8 @@ bin_PROGRAMS = openssl
 dist_man_MANS = openssl.1
 
 openssl_LDADD = $(PLATFORM_LDADD) $(PROG_LDADD)
-openssl_LDADD += $(top_builddir)/ssl/libssl.la
-openssl_LDADD += $(top_builddir)/crypto/libcrypto.la
+openssl_LDADD += $(abs_top_builddir)/ssl/libssl.la
+openssl_LDADD += $(abs_top_builddir)/crypto/libcrypto.la
 
 openssl_SOURCES = apps.c
 openssl_SOURCES += asn1pars.c