Add support for new pnacl native toolchain driver

ports/sdl2-tests/nacl.patch

Index: ports/sdl2-tests/nacl.patch
diff --git a/ports/sdl2-tests/nacl.patch b/ports/sdl2-tests/nacl.patch
index 415dcff53eaba22dada6dc9fd9905e085869d0be..63ad2417ff8592def99cdf442ce5181182287293 100644
--- a/ports/sdl2-tests/nacl.patch
+++ b/ports/sdl2-tests/nacl.patch
@@ -10,19 +10,57 @@ diff --git a/test/autogen.sh b/test/autogen.sh
  do if which $autoconf >/dev/null 2>&1; then $autoconf && found=true; break; fi
  done
  if test x$found = xfalse; then
+diff --git a/test/configure b/test/configure
+--- a/test/configure
++++ b/test/configure
+@@ -2980,6 +2980,22 @@ fi
+         MATHLIB=""
+         SYS_GL_LIBS="-lGLES_CM"
+         ;;
++    *-*-nacl*)
++        case "$CC" in
++            */pnacl-*)
++                EXE=".pexe"
++                ;;
++            */le32-nacl-*)
++                EXE=".pexe"
++                ;;
++            *)
++                EXE=".nexe"
++                ;;
++        esac
++        CFLAGS="$CFLAGS -std=gnu99"
++        MATHLIB="-lm"
++        SYS_GL_LIBS=""
++        ;;
+     *)
+                 ISUNIX="true"
+         EXE=""
+@@ -2988,6 +3004,8 @@ fi
+         ;;
+ esac
+ 
++echo "----------------> Using EXE=$EXE"
++
+ 
+ 
+ 
 diff --git a/test/configure.in b/test/configure.in
 --- a/test/configure.in
 +++ b/test/configure.in
-@@ -67,7 +67,7 @@ case "$host" in
+@@ -67,7 +67,10 @@ case "$host" in
          ;;
      *-*-nacl*)
          case "$CC" in
 -            *pnacl*)
 +            */pnacl-*)
++                EXE=".pexe"
++                ;;
++            */le32-nacl-*)
                  EXE=".pexe"
                  ;;
              *)
-@@ -86,6 +86,8 @@ case "$host" in
+@@ -86,6 +89,8 @@ case "$host" in
          SYS_GL_LIBS="-lGL"
          ;;
  esac