py-defs.mk: Honor PY_INSTALL_INIT_PY = false

PY_ALL_PY is derived from PY_SRC_PY, which wildcards *.py in the module
directory, so a checked-in __init__.py enters the install list
unconditionally. PY_INSTALL_INIT_PY only gates the later append of
__init__.py, which covers files generated at build time. Setting it to
false thus had no effect on an existing __init__.py, which was still
installed together with its .pyc.

Filter __init__.py out of PY_ALL_PY. When PY_INSTALL_INIT_PY is true,
the existing append adds it back, so generated and checked-in
__init__.py files are installed as before. When it is false, an
existing __init__.py is now excluded from PY_ALL_PY and therefore also
from PY_INSTALLED_PY and PY_PYC.

Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v0.84.2
Signed-off-by: Jan Lindemann <jan@janware.com>

make/py-defs.mk

@@ -20,7 +20,7 @@ else
 endif
 
 PY_SRC_PY                   ?= $(wildcard *.py)
-PY_ALL_PY                    = $(PY_SRC_PY)
+PY_ALL_PY                    = $(filter-out __init__.py,$(PY_SRC_PY))
 
 ifneq ($(PYTHON_MAJOR),3)
   PY_PYC                     = $(patsubst %.py,%.pyc,$(PY_ALL_PY))