Fixed "Permission denied" on github-actions.

closure/build.bat

@@ -1,16 +0,0 @@
-@echo off
-
-set csr=\java\8\jre\bin\java.exe -jar \closure-compiler\closure-compiler-v20220104.jar --charset UTF-8 --compilation_level SIMPLE_OPTIMIZATIONS --warning_level VERBOSE
-doskey csr=%csr% $*
-set externs=--externs closure\google-ext.js --externs closure\forge-ext.js --externs closure\pdflib-ext.js --externs closure\zb-externs.js
-
-rem main
-set src=lib
-set jss=--js %src%\zgacertsutil.js --js %src%\zgapdfcryptor.js --js %src%\zgapdfsigner.js --js %src%\zgaindex.js
-echo $
-set chkj=%%externs%% --checks_only %%jss%%
-echo chkj=csr %chkj%
-doskey chkj=%csr% %chkj%
-set csrj=%%externs%% %%jss%% --js_output_file dist\zgapdfsigner.min.js
-echo csrj=csr %csrj%
-doskey csrj=%csr% %csrj%