ICU-21249 Change AppVeyor to not use parallel build due to Cygwin stability issues.
diff --git a/.appveyor.yml b/.appveyor.yml
index 6fcf3f6..d7ee4da 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -66,7 +66,7 @@
- "%CYG_ROOT%\\bin\\sh -lc 'uname -a'"
build_script:
- - '%CYG_ROOT%\\bin\\bash -lc "cd $(cygpath ${APPVEYOR_BUILD_FOLDER}) && cd icu4c/source && ./runConfigureICU Cygwin && make -j2 check"'
+ - '%CYG_ROOT%\\bin\\bash -lc "cd $(cygpath ${APPVEYOR_BUILD_FOLDER}) && cd icu4c/source && ./runConfigureICU Cygwin && make check"'
# -
# matrix: