x86: Build and pass all tests on 32 bit cygwin

* check/lightning.c: Add workaround to conflicting global
	optind variable in cygwin binutils that have an internal
	getopt* implementation.

	* lib/jit_x86-cpu.c: Add a simple define ffsl ffs if building
	for 32 bit and there is no ffsl function.

ChangeLog

@@ -1,3 +1,12 @@
+2014-09-24 Paulo Andrade <pcpa@gnu.org>
+
+	* check/lightning.c: Add workaround to conflicting global
+	optind variable in cygwin binutils that have an internal
+	getopt* implementation.
+
+	* lib/jit_x86-cpu.c: Add a simple define ffsl ffs if building
+	for 32 bit and there is no ffsl function.
+
 2014-09-24 Paulo Andrade <pcpa@gnu.org>
 
         * check/lightning.c: Add a hopefully temporary kludge to not use

check/lightning.c

@@ -3952,6 +3952,16 @@ main(int argc, char *argv[])
     int			 opt_short;
     char		 cmdline[8192];
 
+#if __WORDSIZE == 32 && defined(__CYGWIN__)
+    /* Cause a compile warning about redefinition without dllimport
+     * attribute, *but* cause correct linkage if liblightning.a is
+     * linked to binutils (that happens to have an internal
+     * getopt* implementation and an apparently conflicting
+     * optind global variable) */
+    extern int		 optind;
+    optind = 1;
+#endif
+
     progname = argv[0];
 
     init_jit(progname);

lib/jit_x86-cpu.c

@@ -639,8 +639,12 @@ static void _prolog(jit_state_t*, jit_node_t*);
 static void _epilog(jit_state_t*, jit_node_t*);
 #  define patch_at(node, instr, label)	_patch_at(_jit, node, instr, label)
 static void _patch_at(jit_state_t*, jit_node_t*, jit_word_t, jit_word_t);
-#  if __WORDSIZE == 64 && !defined(HAVE_FFSL)
+#  if !defined(HAVE_FFSL)
+#    if __WORDSIZE == 32
+#      define ffsl(i)			ffs(i)
+#    else
 static int ffsl(long);
+#    endif
 #  endif
 #endif