examples: fix few warnings

Author: zpl-zak

code/apps/examples/base64_enc.c

@@ -28,5 +28,5 @@ int main(int argc, char **argv) {
 void exit_with_help(zpl_opts *opts) {
     zpl_opts_print_errors(opts);
     zpl_opts_print_help(opts);
-    zpl_exit(-1);
+    zpl_exit(1);
 }

code/apps/examples/json_benchmark.c

@@ -11,7 +11,7 @@
 void exit_with_help(zpl_opts *opts) {
     zpl_opts_print_errors(opts);
     zpl_opts_print_help(opts);
-    zpl_exit(-1);
+    zpl_exit(1);
 }
 
 int main(int argc, char **argv) {

code/apps/examples/json_benchmark_arena.c

@@ -10,7 +10,7 @@
 void exit_with_help(zpl_opts *opts) {
     zpl_opts_print_errors(opts);
     zpl_opts_print_help(opts);
-    zpl_exit(-1);
+    zpl_exit(1);
 }
 
 int main(int argc, char **argv) {

misc/win/build_examples.bat

@@ -0,0 +1,8 @@
+@echo off
+
+call %~dp0%\setup_cl_generic.bat amd64
+
+for %%f in (code/apps/examples/*.c) do call %~dp0\build_generic.bat "code/apps/examples/%%f" "%%~nf" "" "" "gdi32.lib user32.lib opengl32.lib" ""
+
+IF NOT %ERRORLEVEL% == 0 (EXIT /b -1)
+