fix make dist for pmix/cray

Include file was left out of "sources" list that prevented
building for cray from dist tarball.

opal/mca/pmix/cray/Makefile.am

@@ -11,6 +11,7 @@ sources = \
         pmix_cray.h \
         pmix_cray_component.c \
         pmix_cray_pmap_parser.c \
+        pmix_cray_pmap_parser.h \
         pmix_cray.c
 
 # Make the output library in this directory, and name it either