[MIPS] Fix ld.bfd linker issue for mipsel

Adding -Wl,--start-group, -Wl,--end-group so that ld.bfd
can resolve library dependencies in case of Android
component build for mipsel.

Bug: 794486
Change-Id: I9ce1867b614aea51382637bc59aa7c7b8c2adbde
Reviewed-on: https://chromium-review.googlesource.com/823905
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#525039}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 71279763dbdd0d8d3a3cb1fb038587ab752ace47

toolchain/gcc_toolchain.gni

@@ -402,7 +402,11 @@ template("gcc_toolchain") {
           rebase_path("//build/toolchain/gcc_solink_wrapper.py", root_build_dir)
       command = "$python_path \"$solink_wrapper\" --readelf=\"$readelf\" --nm=\"$nm\" $strip_switch--sofile=\"$unstripped_sofile\" --tocfile=\"$tocfile\"$map_switch --output=\"$sofile\"$whitelist_flag -- $link_command"
 
+      if (target_cpu == "mipsel" && is_component_build && is_android) {
+        rspfile_content = "-Wl,--start-group -Wl,--whole-archive {{inputs}} {{solibs}} -Wl,--no-whole-archive $solink_libs_section_prefix {{libs}} $solink_libs_section_postfix -Wl,--end-group"
+      } else {
         rspfile_content = "-Wl,--whole-archive {{inputs}} {{solibs}} -Wl,--no-whole-archive $solink_libs_section_prefix {{libs}} $solink_libs_section_postfix"
+      }
 
       description = "SOLINK $sofile"