configure: Improve help-options handling

This patch includes:

* A README.help.md as a general documentation for the different
help types, the LO code and help-related build options.
* Adds --disable-xmlhelp for removing the xmlhelp support from the
build. Disable for iOS, Android and Emscripten. This was partly
included in HAVE_FEATURE_DESKTOP before.
* Rename WITH_HELP define to WITH_HELPPACKS, which reflects the
actual usage AFAIK.
* Depend --with-omindex on --with-help=online and don't override
the --with-help setting. Error out on conflicting options.
* Depend --with-helppack-integration on build help variants, which
actually result in help packs.

Kind of reverts commit 2c38ea6d16b910294220cefaf8ae6a0683e6405a
("Building without --with-help is not supposed to disable help
functionality").

Change-Id: Ie4cb73905b3ed94e991d9f1bd75cfbd6de9da385
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/116222
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>

7 files changed, 7 insertions, 7 deletions

diff --git a/scp2/source/base/file_base.scp b/scp2/source/base/file_base.scp
index 5c50dd3b7af7..e2a8d364bb57 100644
--- a/scp2/source/base/file_base.scp
+++ b/scp2/source/base/file_base.scp
@@ -18,7 +18,7 @@
 
 #include "macros.inc"
 
-#if defined WITH_HELP
+#if defined WITH_HELPPACKS
 File gid_File_Help_Sdatabase_Zip
     Dir = FILELIST_DIR;
     FILELIST_TXT_FILE_BODY_HELPPACK;
diff --git a/scp2/source/calc/file_calc.scp b/scp2/source/calc/file_calc.scp
index 75cbbbc119b9..84ffb5bfe32a 100644
--- a/scp2/source/calc/file_calc.scp
+++ b/scp2/source/calc/file_calc.scp
@@ -25,7 +25,7 @@ File gid_File_Share_Registry_Calc_Xcd
     Name = "calc.xcd";
 End
 
-#if defined WITH_HELP
+#if defined WITH_HELPPACKS
 File gid_File_Help_Scalc_Zip
     Dir = FILELIST_DIR;
     FILELIST_TXT_FILE_BODY_HELPPACK;
diff --git a/scp2/source/draw/file_draw.scp b/scp2/source/draw/file_draw.scp
index 49d6d5dd40dc..93ca07b07af5 100644
--- a/scp2/source/draw/file_draw.scp
+++ b/scp2/source/draw/file_draw.scp
@@ -25,7 +25,7 @@ File gid_File_Share_Registry_Draw_Xcd
     Name = "draw.xcd";
 End
 
-#if defined WITH_HELP
+#if defined WITH_HELPPACKS
 File gid_File_Help_Sdraw_Zip
     Dir = FILELIST_DIR;
     FILELIST_TXT_FILE_BODY_HELPPACK;
diff --git a/scp2/source/impress/file_impress.scp b/scp2/source/impress/file_impress.scp
index f689c62f7b5f..bed62eede8ad 100644
--- a/scp2/source/impress/file_impress.scp
+++ b/scp2/source/impress/file_impress.scp
@@ -25,7 +25,7 @@ File gid_File_Share_Registry_Impress_Xcd
     Name = "impress.xcd";
 End
 
-#if defined WITH_HELP
+#if defined WITH_HELPPACKS
 File gid_File_Help_Simpress_Zip
     Dir = FILELIST_DIR;
     FILELIST_TXT_FILE_BODY_HELPPACK;
diff --git a/scp2/source/math/file_math.scp b/scp2/source/math/file_math.scp
index 12877b8f1eda..790873958261 100644
--- a/scp2/source/math/file_math.scp
+++ b/scp2/source/math/file_math.scp
@@ -25,7 +25,7 @@ File gid_File_Share_Registry_Math_Xcd
     Name = "math.xcd";
 End
 
-#if defined WITH_HELP
+#if defined WITH_HELPPACKS
 File gid_File_Help_Smath_Zip
     Dir = FILELIST_DIR;
     FILELIST_TXT_FILE_BODY_HELPPACK;
diff --git a/scp2/source/ooo/file_ooo.scp b/scp2/source/ooo/file_ooo.scp
index 9bdeab03e702..9a49f163adaa 100644
--- a/scp2/source/ooo/file_ooo.scp
+++ b/scp2/source/ooo/file_ooo.scp
@@ -27,7 +27,7 @@
 
 #include "macros.inc"
 
-#if defined WITH_HELP
+#if defined WITH_HELPPACKS
 File gid_File_Help_Common_Zip
     Dir = FILELIST_DIR;
     FILELIST_TXT_FILE_BODY_HELPPACK;
diff --git a/scp2/source/writer/file_writer.scp b/scp2/source/writer/file_writer.scp
index 28966fc7b696..d29e1594a48c 100644
--- a/scp2/source/writer/file_writer.scp
+++ b/scp2/source/writer/file_writer.scp
@@ -18,7 +18,7 @@
 
 #include "macros.inc"
 
-#if defined WITH_HELP
+#if defined WITH_HELPPACKS
 File gid_File_Help_Swriter_Zip
     Dir = FILELIST_DIR;
     FILELIST_TXT_FILE_BODY_HELPPACK;