Revert "[gn] port 2d4acb0 (LLVM_ENABLE_CURL)"

This reverts commit 0558c7e to match
the revert of 2d4acb0 in  327bfc9

Author: rnk

llvm/utils/gn/secondary/lldb/test/BUILD.gn

@@ -1,7 +1,6 @@
 import("//llvm/triples.gni")
 
 #import("//llvm/utils/gn/build/libs/xar/enable.gni")
-import("//llvm/utils/gn/build/libs/curl/enable.gni")
 import("//llvm/utils/gn/build/libs/xml/enable.gni")
 import("//llvm/utils/gn/build/libs/zlib/enable.gni")
 import("//llvm/utils/gn/build/write_cmake_config.gni")
@@ -92,12 +91,6 @@ write_lit_cfg("lit_api_site_cfg") {
   } else {
     extra_values += [ "SHLIBDIR=" + rebase_path("$root_out_dir/lib", dir) ]
   }
-
-  if (llvm_enable_libcurl) {
-    extra_values += [ "LLVM_ENABLE_CURL=1" ]
-  } else {
-    extra_values += [ "LLVM_ENABLE_CURL=0" ]  # Must be 0.
-  }
 }
 
 write_lit_cfg("lit_shell_site_cfg") {