gh-127111: Emscripten Move link flags from LDFLAGS_NODIST to LINKFORSHARED (#127666)

Corrects the usage of linking flags to avoid compilation errors related to the
use of `-sEXPORTED_FUNCTIONS` when linking shared libraries.

Author: hoodmane

configure

@@ -2325,16 +2325,16 @@ AS_CASE([$ac_sys_system],
     AS_VAR_IF([Py_DEBUG], [yes], [wasm_debug=yes], [wasm_debug=no])
 
     dnl Start with 20 MB and allow to grow
-    AS_VAR_APPEND([LDFLAGS_NODIST], [" -sALLOW_MEMORY_GROWTH -sINITIAL_MEMORY=20971520"])
+    AS_VAR_APPEND([LINKFORSHARED], [" -sALLOW_MEMORY_GROWTH -sINITIAL_MEMORY=20971520"])
 
     dnl map int64_t and uint64_t to JS bigint
     AS_VAR_APPEND([LDFLAGS_NODIST], [" -sWASM_BIGINT"])
 
     dnl Include file system support
-    AS_VAR_APPEND([LDFLAGS_NODIST], [" -sFORCE_FILESYSTEM -lidbfs.js -lnodefs.js -lproxyfs.js -lworkerfs.js"])
-    AS_VAR_APPEND([LDFLAGS_NODIST], [" -sEXPORTED_RUNTIME_METHODS=FS,callMain,ENV"])
-    AS_VAR_APPEND([LDFLAGS_NODIST], [" -sEXPORTED_FUNCTIONS=_main,_Py_Version"])
-    AS_VAR_APPEND([LDFLAGS_NODIST], [" -sSTACK_SIZE=5MB"])
+    AS_VAR_APPEND([LINKFORSHARED], [" -sFORCE_FILESYSTEM -lidbfs.js -lnodefs.js -lproxyfs.js -lworkerfs.js"])
+    AS_VAR_APPEND([LINKFORSHARED], [" -sEXPORTED_RUNTIME_METHODS=FS,callMain,ENV"])
+    AS_VAR_APPEND([LINKFORSHARED], [" -sEXPORTED_FUNCTIONS=_main,_Py_Version"])
+    AS_VAR_APPEND([LINKFORSHARED], [" -sSTACK_SIZE=5MB"])
 
     AS_VAR_IF([enable_wasm_dynamic_linking], [yes], [
       AS_VAR_APPEND([LINKFORSHARED], [" -sMAIN_MODULE"])