ICU-20793 ignore binary file from git  

See #816
diff --git a/.gitignore b/.gitignore
index d6acf6d..668adf6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -99,8 +99,10 @@
 icu4c/source/extra/Makefile
 icu4c/source/extra/scrptrun/Makefile
 icu4c/source/extra/scrptrun/scrptrun.d
+icu4c/source/extra/scrptrun/scrptrun.o
 icu4c/source/extra/scrptrun/srtest
 icu4c/source/extra/scrptrun/srtest.d
+icu4c/source/extra/scrptrun/srtest.o
 icu4c/source/extra/uconv/*.d
 icu4c/source/extra/uconv/*.o
 icu4c/source/extra/uconv/*.vcxproj.user