loader_impl: pass context parameter through `iface`->`load_from_file/memory/package` call sites

[ROKUMATE]

Context

Sub-issue 3 : Part of #634. Follows sub-issue 1 and 2. The three call sites in source/loader/source/loader_impl.c that invoke the interface function pointers must be updated to pass the context parameter.

For now the existing non-_ex internal functions pass NULL. The _ex variants added in sub-issue 4 will pass the real context value.

Changes

File: source/loader/source/loader_impl.c

L1289 — load_from_file call site:

// Before
handle = iface->load_from_file(impl, paths, size);

// After
handle = iface->load_from_file(impl, paths, size, NULL);

L1360 — load_from_memory call site:

// Before
handle = iface->load_from_memory(impl, name, buffer, size);

// After
handle = iface->load_from_memory(impl, name, buffer, size, NULL);

L1399 — load_from_package call site:

// Before
handle = iface->load_from_package(impl, path);

// After
handle = iface->load_from_package(impl, path, NULL);

Also add _ex variants of loader_impl_load_from_file, loader_impl_load_from_memory, loader_impl_load_from_package in both loader_impl.h and loader_impl.c that accept void *context and forward it to the interface call instead of NULL.

Depends on

• Sub-issue 1 (loader_impl_interface: add void *context parameter to load_from_file, load_from_memory, load_from_package typedefs #653): Interface typedef change
• Sub-issue 2 (loaders: add void *context parameter to all load_from_file, load_from_memory, load_from_package implementations #654): All loader implementations updated

Blocks

• Sub-issue 4: Public metacall_load_from_*_ex API