Link executables against libsqlite3.so.
Fix building with dlopen() not available.

--- Makefile.am
+++ Makefile.am
@@ -1,15 +1,16 @@
 
-AM_CFLAGS = @THREADSAFE_FLAGS@ @DYNAMIC_EXTENSION_FLAGS@ @FTS5_FLAGS@ @JSON1_FLAGS@ -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_RTREE
+AM_CFLAGS = @THREADSAFE_FLAGS@ @DYNAMIC_EXTENSION_FLAGS@ @FTS5_FLAGS@ @JSON1_FLAGS@ -DSQLITE_ENABLE_EXPLAIN_COMMENTS -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_RTREE
 
 lib_LTLIBRARIES = libsqlite3.la
 libsqlite3_la_SOURCES = sqlite3.c
 libsqlite3_la_LDFLAGS = -no-undefined -version-info 8:6:8
 
 bin_PROGRAMS = sqlite3
-sqlite3_SOURCES = shell.c sqlite3.c sqlite3.h
-sqlite3_LDADD = @READLINE_LIBS@
+sqlite3_SOURCES = shell.c sqlite3.h
+EXTRA_sqlite3_SOURCES = sqlite3.c
+sqlite3_LDADD = @EXTRA_SHELL_OBJ@ @READLINE_LIBS@
 sqlite3_DEPENDENCIES = @EXTRA_SHELL_OBJ@
-sqlite3_CFLAGS = $(AM_CFLAGS) -DSQLITE_ENABLE_EXPLAIN_COMMENTS
+sqlite3_CFLAGS = $(AM_CFLAGS)
 
 include_HEADERS = sqlite3.h sqlite3ext.h
 
--- configure.ac
+++ configure.ac
@@ -89,6 +89,9 @@
   [], [enable_dynamic_extensions=yes])
 if test x"$enable_dynamic_extensions" != "xno"; then
   AC_SEARCH_LIBS(dlopen, dl)
+  if test "${ac_cv_search_dlopen}" = "no" ; then
+    DYNAMIC_EXTENSION_FLAGS=-DSQLITE_OMIT_LOAD_EXTENSION=1
+  fi
 else
   DYNAMIC_EXTENSION_FLAGS=-DSQLITE_OMIT_LOAD_EXTENSION=1
 fi