[config] some libcurl changes for static linking

configure.ac

@@ -86,7 +86,7 @@ AC_SEARCH_LIBS(BZ2_bzopen, bz2,
 AC_SUBST(BZIP2_SUPPORT)
 AC_SEARCH_LIBS(dlopen, dl)
 AC_SEARCH_LIBS(backtrace, execinfo)
-LIBCURL_CHECK_CONFIG()
+LIBCURL_CHECK_CONFIG([], [test x"${enable_static}" != x"no"])
 
 # Sometimes, curses depends on these libraries being linked in...
 AC_ARG_ENABLE([tinfo],

m4/libcurl.m4

@@ -127,7 +127,11 @@ AC_DEFUN([LIBCURL_CHECK_CONFIG],
               LIBCURL_CPPFLAGS=`$_libcurl_config --cflags`
            fi
            if test x"$LIBCURL" = "x" ; then
-              LIBCURL=`$_libcurl_config --libs`
+              if $2; then
+                 LIBCURL=`$_libcurl_config --static-libs`
+              else
+                 LIBCURL=`$_libcurl_config --libs`
+              fi
 
               # This is so silly, but Apple actually has a bug in their
               # curl-config script.  Fixed in Tiger, but there are still