Cloudooo also uses libpng1.2 and libpng1.6 simultaneously

Fix it similarly to how readline is handled in ERP5 SR.

nxdbom/__init__.py

@@ -311,8 +311,9 @@ def namever(url, failonerr=True): # -> (name, ver)  | None if !failonerr
         ver = del_tgztail(ver)
         ver = removeprefix(ver, 'v')
     # XXX hack: in ERP5 SR we use both readline8 and readline-5
-    if name == 'readline' and ver.startswith('5'):
-        name += '5'
+    # XXX       in Cloudooo SR ----//---- libpng16 and libpng12
+    if name == 'readline' and ver.startswith('5'):    name += '5'
+    if name == 'libpng'   and ver.startswith('1.2'):  name += '12'
     return name, ver
 
 def _namever(url, failonerr):

nxdbom/nxdbom_test.py

@@ -306,15 +306,25 @@ recipe = plone.recipe.command
 """, '')
 
 # readline 8 and 5 used simultaneously    ->  older one is presented as readline5
+# libpng   12 and 16 used simultaneously  ->  ----//----                libpng12
 case1("""\
 [readline]
 recipe = slapos.recipe.cmmi
 url = http://ftp.gnu.org/gnu/readline/readline-8.1.tar.gz
-
 [readline5]
 recipe = slapos.recipe.cmmi
 url = http://ftp.gnu.org/gnu/readline/readline-5.2.tar.gz
+
+[libpng]
+recipe = slapos.recipe.cmmi
+url = http://download.sourceforge.net/libpng/libpng-1.6.37.tar.xz
+[libpng12]
+recipe = slapos.recipe.cmmi
+url = http://download.sourceforge.net/libpng/libpng-1.2.59.tar.xz
+
 """, """\
+libpng                       1.6.37     http://download.sourceforge.net/libpng/libpng-1.6.37.tar.xz
+libpng12                     1.2.59     http://download.sourceforge.net/libpng/libpng-1.2.59.tar.xz
 readline                     8.1        http://ftp.gnu.org/gnu/readline/readline-8.1.tar.gz
 readline5                    5.2        http://ftp.gnu.org/gnu/readline/readline-5.2.tar.gz
 """)