env: Adjust librosprite dependency inclusion

* It made no sense to include it in the RISC OS builds.
  The RISC OS front end is the only one that can handle sprites
  without this library.

* The only front ends that don't default NETSURF_USE_ROSPRITE
  to NO are: `beos`, `framebuffer`, and `gtk`, which set it to
  AUTO.

* This adjusts it so it's recognised as a dependency for the
  default HOST case, which is typically used for native linux
  `framebuffer`/`gtk` builds.

Author: tlsa

docs/env.sh

@@ -371,7 +371,7 @@ case "$BUILD_TARGET" in
                 # tools required to build the browser for RISC OS
                 NS_TOOLS="nsgenbind"
                 # libraries required for the risc os target abi
-                NS_FRONTEND_LIBS="libsvgtiny librufl libpencil librosprite"
+                NS_FRONTEND_LIBS="libsvgtiny librufl libpencil"
                 ;;
             *-atari-mint)
                 # tools required to build the browser for atari
@@ -403,7 +403,7 @@ case "$BUILD_TARGET" in
                 # default tools required to build the browser
                 NS_TOOLS="nsgenbind"
                 # default additional internal libraries
-                NS_FRONTEND_LIBS="libsvgtiny libnsfb"
+                NS_FRONTEND_LIBS="libsvgtiny libnsfb librosprite"
                 ;;
         esac
         ;;