Replace deprecated Automake INCLUDES variable with AM_CPPFLAGS
Replace deprecated Automake INCLUDES variable with AM_CPPFLAGS

Excerpt https://lists.gnu.org/archive/html/automake/2012-12/msg00038.html

  - Support for the long-deprecated INCLUDES variable will be removed
    altogether in Automake 1.14.  The AM_CPPFLAGS variable should be
    used instead.

This variable was deprecated in Automake releases prior to 1.10, which is
the current minimum level required to build X.

Signed-off-by: Alan Coopersmith <ea3248f8c2440b9439894eab21ef26209b22bacf@oracle.com>

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