overlay: one declaration per placement for three data labels

[mateuszklysz]

Before

After #182, src/overlays/l14/gameplay/entities/002fded0.c declared D_L14_00161FBC under the same name twice, once plain and once with sda. D_L14_00161FC0 also had two declarations: an _gp alias and a plain-named sda one. 001ff938.c and 00203b18.c used D_0015EE18_gp_gp for the label D_0015EE18_gp.

After

• 002fded0.c: one sda declaration each for D_L14_00161FBC and D_L14_00161FC0, at the top. The *(float *)& casts around them are gone.
• 001ff938.c, 00203b18.c: D_0015EE18_gp_gp is D_0015EE18_gp.

3 files, declarations and names only.

Verification

• make elf: not run (no change to the boot ELF sources)
• Overlays: each of the 3 files was built through the make overlays route (ninja c/<file>.c.o). Its .text, data and relocations (offset, type, symbol) match main. 00203b18.c also compiles with -DNON_MATCHING.
• scripts/test_public_tools.py passes (99 tests OK); data-decls.py still reports 613

[github-actions]

Decompilation progress

	C_EXACT	Change	Matched bytes	Functions	C_FUZZY
All code	88.45 %	—	3,136,836 / 3,546,268 B (—)	3,980 / 4,233 (—)	89.70 %
Boot executable	85.65 %	—	302,216 / 352,840 B (—)	1,163 / 1,219 (—)	98.13 %
Game	84.51 %	—	230,576 / 272,844 B (—)	866 / 905 (—)	98.40 %
SDK	89.55 %	—	71,640 / 79,996 B (—)	297 / 314 (—)	97.21 %
Level overlays	88.76 %	—	2,834,620 / 3,193,428 B (—)	2,817 / 3,014 (—)	88.76 %
Shared level code	80.64 %	—	911,592 / 1,130,492 B (—)	1,442 / 1,583 (—)	80.64 %
Per-level code	93.22 %	—	1,923,028 / 2,062,936 B (—)	1,375 / 1,431 (—)	93.22 %

	Data in C	Change	Matched bytes
All data	32.31 %	—	4,017,559 / 12,433,372 B (—)
Boot executable	2.16 %	—	15,091 / 699,136 B (—)
Level overlays	34.11 %	—	4,002,468 / 11,734,236 B (—)

No function changed its match state compared with main (ae03241).

_{Compared with main (ae03241). C_FUZZY uses main's last measurement.}

[decomp-dev]

Report for SCUS_971.99 (ae03241 - c11b384)

No changes