fix build system again (now it creates a .la file)

Makefile.am

@@ -6,5 +6,5 @@ lib_LTLIBRARIES = \
 
 libbrandt_la_SOURCES = \
   smc.c
-libbrandt_la_LDADD = \
+libbrandt_la_LIBADD = \
   -lpari

configure.ac

@@ -11,7 +11,7 @@ AC_CONFIG_SRCDIR([smc.c])
 
 # Checks for programs.
 AC_PROG_CC_C99
-#AX_APPEND_COMPILE_FLAGS([-std=c99])
+LT_INIT([pic-only])
 
 # Checks for libraries.
 AC_SEARCH_LIBS([pari_init], [pari], [], [AC_MSG_ERROR([unable to find the pari_init() function from libpari])])