Add '--enable-libtls-only' build option

crypto/Makefile.am

@@ -9,7 +9,13 @@ AM_CPPFLAGS += -I$(top_srcdir)/crypto/evp
 AM_CPPFLAGS += -I$(top_srcdir)/crypto/modes
 AM_CPPFLAGS += -I$(top_srcdir)/crypto
 
+noinst_LTLIBRARIES = libcompat.la
+
+if ENABLE_LIBTLS_ONLY
+noinst_LTLIBRARIES += libcrypto.la
+else
 lib_LTLIBRARIES = libcrypto.la
+endif
 
 EXTRA_DIST = VERSION
 EXTRA_DIST += CMakeLists.txt
@@ -126,8 +132,6 @@ else
 libcrypto_la_CPPFLAGS += -DOPENSSLDIR=\"$(sysconfdir)/ssl\"
 endif
 
-noinst_LTLIBRARIES = libcompat.la
-
 # compatibility functions that need to be built without optimizations
 if !HAVE_EXPLICIT_BZERO
 noinst_LTLIBRARIES += libcompatnoopt.la