buildServer: fix for Windows10/cygwin/bash being unable to launch recursively.

jenkins_build.sh

@@ -174,19 +174,13 @@ case "$build" in
 			/usr/local/bin/exiv2 -v -V
 			result=$?
         else
-			if [ "$x64" == true ]; then
 			export RECURSIVE=1
+			# don't recursively invoke bash as this dies on Windows 10.
+			# simply call the script again in the same bash session
 			# /cygdrive/c/cygwin64/bin/bash.exe -c "cd $PWD ; ./$0"
-				cd "$PWD" ; ./$0
-				result=$?
-			fi
-			if [ "$Win32" == true ]; then
-				export RECURSIVE=1
-				# /cygdrive/c/cygwin/bin/bash.exe -c "cd $PWD ; ./$0"
-				cd "$PWD" ; ./$0
+			./$0
 			result=$?
         fi
-        fi
   ;;
 
   MING)