Use rpm's native resource tunable to limit parallelism.

rpm 4.19 and newer have built-in tunable settings to limit
parallel tasks which make %constrain_build redundant.

See BZ#2404624

.gitignore

@@ -7,3 +7,4 @@ gimp-help-2.4.2.tar.bz2
 /gimp-help-2.10.0.tar.bz2
 /gimp-help-2.10.34.tar.bz2
 /gimp-help-2.99.0-git2b4f24e36.tar.xz
+/gimp-help-3.0.0.tar.bz2

gimp-help.spec

@@ -1,13 +1,13 @@
 # NOTE: en/English is in the main package
 # LANGUAGES: bg,Bulgarian ca,Catalan cs,Czech da,Danish de,German el,Greek en_GB,British_English es,Spanish fa,Farsi fi,Finnish fr,French hr,Croatian hu,Hungarian it,Italian ja,Japanese ko,Korean lt,Lithuanian nl,Dutch nn,Norwegian_Nynorsk pl,Polish pt,Portuguese pt_BR,Brazilian_Portuguese ro,Romanian ru,Russian sl,Slovenian sv,Swedish tr,Turkish uk,Ukrainian zh_CN,Simplified_Chinese
 
-%constrain_build -m 6144
+%global _smp_tasksize_proc 6144
 
 %global gimpsubver 3.0
 
 Summary: Help files for GIMP
 Name: gimp-help
-Version: 2.99.0~20250212git2b4f24e36
+Version: 3.0.0
 Release: %autorelease
 License: GFDL-1.2-invariants-only
 URL: https://docs.gimp.org/
@@ -30,7 +30,7 @@ ExcludeArch: s390x
 }
 
 %if ! %defined snapshot
-Source0: https://download.gimp.org/pub/gimp/help/gimp-help-%{version}.tar.xz
+Source0: https://download.gimp.org/pub/gimp/help/gimp-help-%{version}.tar.bz2
 %else
 Source0: gimp-help-%{plain_version}-git%{git_rev}.tar.xz
 %endif

sources

@@ -1 +1 @@
-SHA512 (gimp-help-2.99.0-git2b4f24e36.tar.xz) = 913d0962b07f7e06c894fdcece2bd15ffadddd2765256d6a71e5756cf5df49aa983210e28b12d34e9056adef68231f9af76224f79a3dfc07eea8c17fc8edd5ff
+SHA512 (gimp-help-3.0.0.tar.bz2) = 4a240bfebb633c1603057474adeb2bf2e42fcc65f5c5b696e5202bad18940eba69b1b12f6493b470b6f402cee7d6dcbd23f83c9e2871f459a420b7c521a0bd6d