build: Don't duplicate Libs in Libs.private in pkg-config file

pkg-config already prepends Libs to Libs.private when you specify
--static so there's no need to duplicate them. Most other projects
don't do this.

CMakeLists.txt

@@ -1962,7 +1962,7 @@ Libs.private:")
 
   # Clean up the different lists
   listtostr(EXTRA_LIBS _EXTRA_LIBS "-l")
-  set(SDL_STATIC_LIBS ${SDL_LIBS} ${EXTRA_LDFLAGS} ${_EXTRA_LIBS})
+  set(SDL_STATIC_LIBS ${EXTRA_LDFLAGS} ${_EXTRA_LIBS})
   list(REMOVE_DUPLICATES SDL_STATIC_LIBS)
   listtostr(SDL_STATIC_LIBS _SDL_STATIC_LIBS)
   set(SDL_STATIC_LIBS ${_SDL_STATIC_LIBS})

configure

@@ -25717,7 +25717,7 @@ else
   SDL_RLD_FLAGS=""
 fi
 
-SDL_STATIC_LIBS="$SDL_LIBS $EXTRA_LDFLAGS"
+SDL_STATIC_LIBS="$EXTRA_LDFLAGS"
 
 
 

configure.ac

@@ -4271,7 +4271,7 @@ else
   SDL_RLD_FLAGS=""
 fi
 
-SDL_STATIC_LIBS="$SDL_LIBS $EXTRA_LDFLAGS"
+SDL_STATIC_LIBS="$EXTRA_LDFLAGS"
 
 dnl Expand the cflags and libraries needed by apps using SDL
 AC_SUBST(SDL_CFLAGS)

sdl2-config.in

@@ -49,7 +49,7 @@ while test $# -gt 0; do
 @ENABLE_SHARED_TRUE@      ;;
 @ENABLE_STATIC_TRUE@@ENABLE_SHARED_TRUE@    --static-libs)
 @ENABLE_STATIC_TRUE@@ENABLE_SHARED_FALSE@    --libs|--static-libs)
-@ENABLE_STATIC_TRUE@      echo -L@libdir@ @SDL_STATIC_LIBS@
+@ENABLE_STATIC_TRUE@      echo -L@libdir@ @SDL_LIBS@ @SDL_STATIC_LIBS@
 @ENABLE_STATIC_TRUE@      ;;
     *)
       echo "${usage}" 1>&2