build: remove .txt files from .gitignore

Refs: #32670 (comment)

PR-URL: #32710
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Sam Roberts <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>

Author: Trott

.gitignore

@@ -36,7 +36,6 @@
 /*.exe
 /*.swp
 /out
-/*.txt
 
 # === Rules for artifacts of `./configure` ===
 /icu_config.gypi