remove some unneeded checks from autoconf

.travis.yml

@@ -16,16 +16,20 @@ matrix:
       before_script:
         - ./bootstrap
       script:
-        - ./configure && make
+        - ./configure
+        - make
         - zip -j $NAME-$TRAVIS_OS_NAME src/$NAME
+        - unzip -l $NAME-$TRAVIS_OS_NAME
     - os: osx
       install:
         - HOMEBREW_NO_AUTO_UPDATE=1 brew install xa sdl2
       before_script:
         - ./bootstrap
       script:
-        - ./configure && make
+        - ./configure
+        - make
         - zip -j $NAME-$TRAVIS_OS_NAME src/$NAME
+        - unzip -l $NAME-$TRAVIS_OS_NAME
     - os: linux # cross compile to windows
       dist: xenial
       sudo: required

configure.ac

@@ -15,7 +15,6 @@ AC_PROG_CXX
 AC_LANG([C++])
 AC_REQUIRE_CPP
 AC_PROG_INSTALL
-AC_PROG_LN_S
 AC_PROG_MAKE_SET
 AC_PROG_RANLIB
 AC_PATH_PROGS([XA65],[xa65 xa])
@@ -61,9 +60,8 @@ AC_HEADER_STDBOOL
 AC_C_CONST
 AC_C_INLINE
 AC_TYPE_SIZE_T
-AC_CHECK_HEADERS([windows.h])
-AC_CHECK_HEADER([windows.h],[WINDOWS=true].[WINDOWS=])
-AM_CONDITIONAL([HAVE_WINDOWS],test "$WINDOWS")
+
+
 
 # Checks for library functions.
 AC_HEADER_STDC