For some reason -g is not ending up in CFLAGS for some builds in Travis, 
which is likely a configure script bug of some kind.

Work around it by defaulting CFLAGS to -g which should be always
harmless.
e.g. https://travis-ci.com/github/apache/httpd/jobs/526267899

Github: closes #205


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1891806 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/.travis.yml b/.travis.yml
index 5b61438..ad0cc7d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -32,6 +32,7 @@
 env:
   global:
     - MFLAGS=-j2
+    - CFLAGS=-g
 
 # This defines two condition anchors which can be used in job
 # definitions to either: