Skip checking for symbol leaks in libruby.so linking extensions

The libruby.so linking extension libraries contain symbols exported
from extension libraries, and is not subject of test-leaked-globals.

template/Makefile.in

@@ -643,7 +643,7 @@ un-runnable:
 	$(ECHO) cannot make runnable, configure with --enable-load-relative.
 	$(Q) exit 1
 
-LIBRUBY_FOR_LEAKED_GLOBALS = $(enable_shared:no=$(EXTSTATIC:static=))
+LIBRUBY_FOR_LEAKED_GLOBALS = $(enable_shared:no=)
 yes-test-basic: $(DOT_WAIT) test-leaked-globals
 leaked-globals: test-leaked-globals
 yes-test-leaked-globals-precheck: $(COMMONOBJS) prog $(tooldir)/leaked-globals
@@ -653,6 +653,7 @@ yes-test-leaked-globals: yes-test-leaked-globals-precheck
 	$(Q) $(XRUBY) $(tooldir)/leaked-globals \
 	  SOEXT=$(SOEXT) NM="$(NM) -Pgp" SYMBOL_PREFIX=$(SYMBOL_PREFIX) \
 	  SYMBOLS_IN_EMPTYLIB="@XSYMBOLS_IN_EMPTYLIB@" \
+	  EXTSTATIC="$(EXTSTATIC)" \
 	  PLATFORM=$(hdrdir)/ruby/$(PLATFORM_DIR).h $(srcdir)/configure.ac \
 	  $(COMMONOBJS) $(LIBRUBY_FOR_LEAKED_GLOBALS:yes=$(LIBRUBY_SO))
 	$(ACTIONS_ENDGROUP)

tool/leaked-globals

@@ -13,12 +13,15 @@ until ARGV.empty?
     soext = $1
   when /\A SYMBOLS_IN_EMPTYLIB=(.*)/x
     SYMBOLS_IN_EMPTYLIB = $1.split(" ")
+  when /\A EXTSTATIC=(.+)?/x
+    EXTSTATIC = true
   else
     break
   end
   ARGV.shift
 end
 SYMBOLS_IN_EMPTYLIB ||= nil
+EXTSTATIC ||= false
 
 config = ARGV.shift
 count = 0
@@ -56,8 +59,14 @@ REPLACE.push("rust_eh_personality") if RUBY_PLATFORM.include?("darwin")
 
 print "Checking leaked global symbols..."
 STDOUT.flush
-soext = /\.#{soext}(?:$|\.)/ if soext
-so = soext =~ ARGV.first if ARGV.size == 1
+if soext
+  soext = /\.#{soext}(?:$|\.)/
+  if EXTSTATIC
+    ARGV.delete_if {|n| soext =~ n}
+  elsif ARGV.size == 1
+    so = soext =~ ARGV.first
+  end
+end
 IO.foreach("|#{NM} #{ARGV.join(' ')}") do |line|
   line.chomp!
   next so = nil if line.empty?