ICU-13813 Windows icucheck.bat script does not handle if the tests cr…

…ash while executing. (#12)

Fix the `icucheck.bat` script (used to run the ICU4C tests on Windows) so that it handles the case where a test crashes while executing.

icu4c/source/allinone/icucheck.bat

@@ -52,7 +52,7 @@ set ICUFAILCNT=0
 @echo ==== %THT% =========================================================================
 %ICUINFO_CMD% %ICUINFO_OPTS%
 
-@IF NOT ERRORLEVEL 1 GOTO OK_%THT%
+@IF %ERRORLEVEL% EQU 0 GOTO OK_%THT%
 @set ICUFAILED=%ICUFAILED% %THT%
 @set ICUFAILCNT=1
 :OK_icuinfo
@@ -63,7 +63,7 @@ set ICUFAILCNT=0
 @cd %ICU_ICUDIR%\source\test\intltest
 %INTLTEST_CMD% %INTLTEST_OPTS%
 
-@IF NOT ERRORLEVEL 1 GOTO OK_%THT%
+@IF %ERRORLEVEL% EQU 0 GOTO OK_%THT%
 @set ICUFAILED=%ICUFAILED% %THT%
 @set ICUFAILCNT=1
 :OK_intltest
@@ -74,7 +74,7 @@ set ICUFAILCNT=0
 @cd %ICU_ICUDIR%\source\test\iotest
 %IOTEST_CMD% %IOTEST_OPTS%
 
-@IF NOT ERRORLEVEL 1 GOTO OK_%THT%
+@IF %ERRORLEVEL% EQU 0 GOTO OK_%THT%
 @set ICUFAILED=%ICUFAILED% %THT%
 @set ICUFAILCNT=1
 :OK_IOTEST
@@ -85,7 +85,7 @@ set ICUFAILCNT=0
 @cd %ICU_ICUDIR%\source\test\cintltst
 %CINTLTST_CMD% %CINTLTST_OPTS%
 
-@IF NOT ERRORLEVEL 1 GOTO OK_%THT%
+@IF %ERRORLEVEL% EQU 0 GOTO OK_%THT%
 @set ICUFAILED=%ICUFAILED% %THT%
 @set ICUFAILCNT=1
 :OK_cintltst
@@ -97,7 +97,7 @@ set ICUFAILCNT=0
 @REM  @cd %ICU_ICUDIR%\source\test\letest
 @REM  %LETST_CMD% %LETEST_OPTS%
 
-@REM  @IF NOT ERRORLEVEL 1 GOTO OK_%THT%
+@REM  @IF %ERRORLEVEL% EQU 0 GOTO OK_%THT%
 @REM  @set ICUFAILED=%ICUFAILED% %THT%
 @REM  @set ICUFAILCNT=1
 @REM  :OK_letest