fix:pkg: make threaded (and dev and library-only) build flags manual [#2495]

The threaded runtime is required at least for hledger's pager output,
and probably for other things. It's controlled by the "threaded" build
flag for some historical reason. Now, that flag is marked as manual,
so that it can no longer be toggled by cabal. (Probably the build flag
should be dropped, that can be tried later.)

Related: Debian bug #1120833, causing an unusable hledger-1.50.2 package.

hledger-ui/hledger-ui.cabal

@@ -45,7 +45,7 @@ flag debug
 
 flag threaded
   description: Build with support for multithreaded execution
-  manual: False
+  manual: True
   default: True
 
 library

hledger-ui/package.yaml

@@ -32,7 +32,7 @@ flags:
   threaded:
     description: Build with support for multithreaded execution
     default: true
-    manual:  false
+    manual:  true
   debug:
     description: Build with GHC 9.10+ stack traces enabled
     default: false

hledger-web/hledger-web.cabal

@@ -120,17 +120,17 @@ flag debug
 
 flag dev
   description: Turn on development settings, like auto-reload templates.
-  manual: False
+  manual: True
   default: False
 
 flag library-only
   description: Build for use with "yesod devel"
-  manual: False
+  manual: True
   default: False
 
 flag threaded
   description: Build with support for multithreaded execution.
-  manual: False
+  manual: True
   default: True
 
 library

hledger-web/package.yaml

@@ -50,15 +50,15 @@ flags:
   library-only:
     description: Build for use with "yesod devel"
     default: false
-    manual:  false
+    manual:  true
   dev:
     description: Turn on development settings, like auto-reload templates.
     default: false
-    manual:  false
+    manual:  true
   threaded:
     description: Build with support for multithreaded execution.
     default: true
-    manual:  false
+    manual:  true
   debug:
     description: Build with GHC 9.10+ stack traces enabled   # '
     default: false

hledger/hledger.cabal

@@ -103,7 +103,7 @@ flag debug
 
 flag threaded
   description: Build with support for multithreaded execution
-  manual: False
+  manual: True
   default: True
 
 library

hledger/package.yaml

@@ -94,7 +94,7 @@ flags:
   threaded:
     description: Build with support for multithreaded execution
     default: true
-    manual:  false
+    manual:  true
   debug:
     description: Build with GHC 9.10+ stack traces enabled
     default: false