Fixed assembler command line for older yasm releases and documented nasm

 switches.

   Fixes Bugzilla #440.

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%402366

configure.in

@@ -706,7 +706,7 @@ AC_HELP_STRING([--enable-nasm], [use nasm assembly blitters on x86 [[default=yes
         if test "x$NASM" != x -a "x$NASM" != x'"$NASM"'; then
             AC_DEFINE(SDL_HERMES_BLITTERS)
             SOURCES="$SOURCES $srcdir/src/hermes/*.asm"
-            NASMFLAGS="$NASMFLAGS -i $srcdir/src/hermes/"
+            NASMFLAGS="$NASMFLAGS -I $srcdir/src/hermes/"
 
             dnl See if hidden visibility is supported
             echo "GLOBAL _bar:function hidden" > symbol-visibility