Fix Partials merging adjacent #define macros when one has a comment with an apostrophe (#1262)

[mkarlesky]

Fixes #1262. This is a port of #1269 (already merged/green on next_version) to master, for inclusion in 1.1.8.

Root cause

_collect_directive (the #define/directive scanner in c_extractor_preprocessing.rb) scanned every " or ' character on a directive line as the start of a string/char literal — including one appearing inside a trailing // or /* */ comment. An ordinary English contraction in a macro's comment, e.g.:

#define START_ADDRESS 0x00 // don't change this
#define IDX_DATARATE (ADS124S08_REG_ADDR_DATARATE - START_ADDRESS)

opened what looked like an unterminated char literal at the apostrophe in "don't", sending skip_c_string hunting for a closing ' straight through this directive's own newline and into the following #define line(s) — silently merging them into a single macro_definitions entry with no separating newline.

Partials generation (generator_partials.rb) then faithfully wrote that already-corrupted, newline-less text back out, producing a generated ..._impl.h with two #define lines concatenated onto one physical line — a hard stray '#' in program compile error, exactly as reported.

Fix

Comment content (both // and /* */) is now captured verbatim without being scanned for string/char literal delimiters. A \ immediately before the newline inside a // comment still splices lines (matching how backslash-newline continuation already works everywhere else in a directive), so a multi-line macro whose continuation line happens to start with a comment still extracts correctly.

Tests

Same coverage as #1269: new #try_extract_directive cases in c_extractor_preprocessing_spec.rb, adjacency-reconstruction tests in c_extractor_integration_spec.rb, and byte-exact adjacency tests (macros/typedefs/aggregates) in generator_partials_spec.rb. Unit tests only, no system tests. bundle exec rake specs:units clean on host (1989 examples, 0 failures, 1 pre-existing unrelated pending).

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