ffsync: Fix for MariaDB binaries

[mreid-tt]

Description

This is a follow-on from #6793 to fix the path for the MariaDB binaries on DSM 7.3.

Fixes #6878

Checklist

• Build rule all-supported completed successfully
• New installation of package completed successfully
• Package upgrade completed successfully (Manually install the package again)
• Package functionality was tested
• Any needed documentation is updated/created

Type of change

• Bug fix

[mreid-tt]

hey @th0ma7 I'm getting build failures on this and I wonder if this may be related to #6868?

EDIT: From what I see:

ERROR: /spksrc/spk/ffsync/work-x64-7.1/install/var/packages/python312/target/bin/python3.12 does not exist                                                        

In my Docker environment, yes within the /spksrc/spk/ffsync folder...
./work-x64-7.1/install/var/packages/python312/target/bin/python3.12 does not exist but...
./work-x64-7.1/install/var/packages/ffsync/target/bin/python3.12 does.

We may need to edit this line?

spksrc/mk/spksrc.crossenv.mk

Line 184 in 988dd7f

$(RUN) $(PYTHON_NATIVE) -m crossenv $(abspath $(PYTHON_WORK_DIR)/install/$(PYTHON_INSTALL_PREFIX)/bin/python$(PYTHON_PKG_VERS_MAJOR_MINOR)) \

Alternately get Python to build in:
/spksrc/spk/ffsync/work-x64-7.1/install/var/packages/python312/target/bin/python3.12
instead of:
/spksrc/spk/ffsync/work-x64-7.1/install/var/packages/ffsync/target/bin/python3.12