t/Makefile: provide GNU make required hint
commit40e83efb56f2df73b53672abb500c0b3a0cfab9a
authorKyle J. McKay <mackyle@gmail.com>
Sat, 1 Apr 2017 18:48:23 +0000 (1 11:48 -0700)
committerKyle J. McKay <mackyle@gmail.com>
Sat, 1 Apr 2017 18:48:23 +0000 (1 11:48 -0700)
tree3d2436df0c8b0a68ca118f111149256c85a9de37
parentc4e0f1002a476b3de739239a38cd920f3be60a18
t/Makefile: provide GNU make required hint

Add a few simple lines that will cause non-GNU makes to
choke early usually with a more helpful error than just
a bunch of syntax errors as would othrewise likely result
when a non-GNU make reads the file.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
t/Makefile