build: add static option to vcbuild.bat

Passes --enable-static to ./configure.

PR-URL: #12764
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

Author: Tony Rice

vcbuild.bat

@@ -39,6 +39,7 @@ set enable_vtune_arg=
 set configure_flags=
 set build_addons=
 set dll=
+set enable_static=
 
 :next-arg
 if "%1"=="" goto args-done
@@ -82,6 +83,7 @@ if /i "%1"=="download-all"  set download_arg="--download=all"&goto arg-ok
 if /i "%1"=="ignore-flaky"  set test_args=%test_args% --flaky-tests=dontcare&goto arg-ok
 if /i "%1"=="enable-vtune"  set enable_vtune_arg=1&goto arg-ok
 if /i "%1"=="dll"           set dll=1&goto arg-ok
+if /i "%1"=="static"           set enable_static=1&goto arg-ok
 
 echo Error: invalid command line option `%1`.
 exit /b 1
@@ -113,6 +115,7 @@ if defined release_urlbase set configure_flags=%configure_flags% --release-urlba
 if defined download_arg set configure_flags=%configure_flags% %download_arg%
 if defined enable_vtune_arg set configure_flags=%configure_flags% --enable-vtune-profiling
 if defined dll set configure_flags=%configure_flags% --shared
+if defined enable_static set configure_flags=%configure_flags% --enable-static
 
 if "%i18n_arg%"=="full-icu" set configure_flags=%configure_flags% --with-intl=full-icu
 if "%i18n_arg%"=="small-icu" set configure_flags=%configure_flags% --with-intl=small-icu