Rename contrib/pngminim/*/makefile.std to makefile.

contrib/pngminim/decoder/README

@@ -1,6 +1,7 @@
 This demonstrates the use of PNG_USER_CONFIG and pngusr.h
 
 To build a minimal read-only decoder, run
-    gather.sh  # to collect needed files from pngminus, libpng, and zlib
+
-    make -f makefile.std
+    gather.sh  # to collect needed files from pngminus, libpng, and zlib
+    make
  

contrib/pngminim/encoder/README

@@ -1,6 +1,7 @@
 This demonstrates the use of PNG_USER_CONFIG and pngusr.h
 
 To build a minimal write-only encoder, run
-    gather.sh  # to collect needed files from pngminus, libpng, and zlib
+
-    make -f makefile.std
+    gather.sh  # to collect needed files from pngminus, libpng, and zlib
+    make
  

contrib/pngminim/preader/README

@@ -1,10 +1,11 @@
 This demonstrates the use of PNG_USER_CONFIG and pngusr.h
 
 To build a minimal read-only progressive decoder with X display, run
-gather.sh to collect needed files from gregbook, libpng, and zlib
 
-Edit makefile.std if required, to find your X library and include files,
+    gather.sh # to collect needed files from gregbook, libpng, and zlib
+
+Edit makefile if required, to find your X library and include files,
 then
     
-    make -f makefile.std
+    make