regenerated configure scripts.

test/configure

@@ -602,6 +602,7 @@ SDL_CFLAGS
 PKG_CONFIG_LIBDIR
 PKG_CONFIG_PATH
 PKG_CONFIG
+ISOS2
 ISUNIX
 ISWINDOWS
 ISMACOSX
@@ -2905,6 +2906,7 @@ fi
 ISUNIX="false"
 ISWINDOWS="false"
 ISMACOSX="false"
+ISOS2="false"
 
 case "$host" in
     *-*-cygwin* | *-*-mingw*)
@@ -2918,7 +2920,7 @@ case "$host" in
         MATHLIB=""
         SYS_GL_LIBS="-lGL"
         ;;
-    *-*-darwin* )
+    *-*-darwin*)
         ISMACOSX="true"
         EXE=""
         MATHLIB=""
@@ -2990,16 +2992,22 @@ fi
         MATHLIB=""
         SYS_GL_LIBS="-lGLES_CM"
         ;;
-    *-*-emscripten* )
+    *-*-emscripten*)
                 EXE=".bc"
         MATHLIB=""
         SYS_GL_LIBS=""
         ;;
-    *-*-riscos* )
+    *-*-riscos*)
         EXE=",e1f"
         MATHLIB=""
         SYS_GL_LIBS=""
         ;;
+    *-*-os2*)
+        ISOS2="true"
+        EXE=".exe"
+        MATHLIB=""
+        SYS_GL_LIBS=""
+        ;;
     *)
                 ISUNIX="true"
         EXE=""
@@ -3054,6 +3062,7 @@ esac
 
 
 
+
 SDL_VERSION=2.0.18