Update bld_catkin.bat.in

Author: Tobias-Fischer

vinca/templates/bld_catkin.bat.in

@@ -40,7 +40,7 @@ cmake ^
 if errorlevel 1 exit 1
 
 if "%PKG_NAME%" == "ros-@(ros_distro)-eigenpy" (
-    cmake --build . --config Release --target all --parallel 3
+    cmake --build . --config Release --target all --parallel 1
     if errorlevel 1 exit 1
 ) else (
     cmake --build . --config Release --target all