Use LD env if available, other tests already do similar for CC.
https://bugs.gentoo.org/729630
--- a/imake.c
+++ b/imake.c
@@ -1110,5 +1110,9 @@
   signed char c;
   int ldmajor, ldminor;
-  const char *ld = "ld -v";
+  char ld[PATH_MAX];
+  const char *ldenv;
+  if (!(ldenv = getenv("LD")))
+    ldenv = "ld";
+  snprintf(ld, PATH_MAX, "%s -v", ldenv);
 
 # ifdef CROSSCOMPILE