Remove unnecessary AM_CPPFLAGS

This commit was SVN r7221.

ompi/mca/rcache/base/Makefile.am

@@ -18,10 +18,6 @@ include $(top_srcdir)/config/Makefile.options
 
 noinst_LTLIBRARIES = libmca_rcache_base.la
 
-# For VPATH builds, have to specify where static-modules.h will be found
-
-AM_CPPFLAGS = -I$(top_builddir)/src
-
 # Source code files
 
 headers = \