resolve patch command on different systems

* copy the original file darshan-apmpi.c to orig_darshan-apmpi.c
  so it can be restored when running make clean
* store the entire patched darshan-apmpi.c as patched_darshan-apmpi.c
  instead of patch file. This is because on some system, e.g. Perlmutter,
  patch command may apply patch files differently

Author: wkliao

modules/Makefile.am

@@ -4,20 +4,21 @@
 # @configure_input@
 
 apmpi_c_src = $(srcdir)/autoperf/apmpi/lib/darshan-apmpi.c
-apmpi_c_saved = $(srcdir)/autoperf/apmpi/lib/saved_darshan-apmpi.c
-apmpi_c_patch = $(srcdir)/apmpi.patch
+apmpi_c_patched = $(srcdir)/patched_darshan-apmpi.c
+apmpi_c_saved = $(srcdir)/saved_darshan-apmpi.c
+apmpi_c_orig = $(srcdir)/orig_darshan-apmpi.c
 
 # Rule to apply the patch
-$(apmpi_c_saved): $(apmpi_c_src) $(apmpi_c_patch)
+$(apmpi_c_saved): $(apmpi_c_src) $(apmpi_c_patched)
 	cp -f $(apmpi_c_src) $(apmpi_c_saved)
-	patch -f -p0 $(apmpi_c_src) < $(apmpi_c_patch)
-	touch $@
+	cp -f $(apmpi_c_patched) $(apmpi_c_src)
+	touch $(apmpi_c_saved)
 
 BUILT_SOURCES = $(apmpi_c_saved)
 
-EXTRA_DIST = apmpi.patch
+EXTRA_DIST = patched_darshan-apmpi.c orig_darshan-apmpi.c
 
-clean: $(apmpi_c_saved)
-	cp -f $(apmpi_c_saved) $(apmpi_c_src)
-	rm -f $(apmpi_c_saved) $(apmpi_c_src).*
+clean:
+	rm -f $(apmpi_c_saved)
+	cp -f $(apmpi_c_orig) $(apmpi_c_src)