'make ARCH=microblaze help' fails with the following error due to a
missing single quote.

/bin/sh: -c: line 0: unexpected EOF while looking for matching `''
/bin/sh: -c: line 1: syntax error: unexpected end of file
make: *** [help] Error 2
Signed-off-by: NArun Bhanu <arun@bhanu.net>
Signed-off-by: NMichal Simek <monstr@monstr.eu>