Bug 1745091 - Remove unused MOZ_LINKER_EXTRACT. r=firefox-build-syste…

…m-reviewers,nalexander

Its use was removed in bug 1314546.

Differential Revision: https://phabricator.services.mozilla.com/D133304

old-configure.in

@@ -816,7 +816,6 @@ AC_SUBST_LIST(SSSE3_FLAGS)
 AC_SUBST(MOZ_LINKER)
 if test -n "$MOZ_LINKER"; then
   AC_DEFINE(MOZ_LINKER)
-  MOZ_LINKER_EXTRACT=1
   AC_CHECK_PROGS(XZ, xz)
 fi
 
@@ -2305,7 +2304,6 @@ AC_SUBST(INCREMENTAL_LINKER)
 AC_SUBST_LIST(MOZ_FIX_LINK_PATHS)
 
 AC_SUBST(MOZ_POST_PROGRAM_COMMAND)
-AC_SUBST(MOZ_LINKER_EXTRACT)
 
 if test -n "$MOZ_BINARY_EXTENSIONS"; then
   AC_DEFINE(MOZ_BINARY_EXTENSIONS)