fix warnings when building openssl with the following compiler options:

-Wmissing-prototypes -Wcomment -Wformat -Wimplicit -Wmain -Wmultichar
        -Wswitch -Wshadow -Wtrigraphs -Werror -Wchar-subscripts
        -Wstrict-prototypes -Wreturn-type -Wpointer-arith  -W -Wunused
        -Wno-unused-parameter -Wuninitialized

crypto/rand/randtest.c

@@ -65,7 +65,7 @@
 /* some FIPS 140-1 random number test */
 /* some simple tests */
 
-int main()
+int main(int argc,char **argv)
 	{
 	unsigned char buf[2500];
 	int i,j,k,s,sign,nsign,err=0;