RFR: JDK-8071781: Bootcycle build fails on macosx

[Erik Joelsson]

Hello,

Please review this small fix for bootcycle-images on macosx. The space 
in the patsubst call caused HOTSPOT_DIST to contain a leading space 
which in turn made hotspot/make/bsd/makefiles/universal.gmk fail to run 
lipo on the files in HOTSPOT_DIST in the second phase bootcycle build.

Bug: https://bugs.openjdk.java.net/browse/JDK-8071781
Patch inline:
diff --git a/common/autoconf/bootcycle-spec.gmk.in 
b/common/autoconf/bootcycle-spec.gmk.in
--- a/common/autoconf/bootcycle-spec.gmk.in
+++ b/common/autoconf/bootcycle-spec.gmk.in
@@ -48,8 +48,9 @@
  # The bootcycle build has a different output directory
  OLD_BUILD_OUTPUT:=@BUILD_OUTPUT@
  BUILD_OUTPUT:=$(OLD_BUILD_OUTPUT)/bootcycle-build
-# The HOTSPOT_DIST dir is not defined relative to BUILD_OUTPUT in spec.gmk
-HOTSPOT_DIST:=$(patsubst $(OLD_BUILD_OUTPUT)%, $(BUILD_OUTPUT)%, 
$(HOTSPOT_DIST))
+# The HOTSPOT_DIST dir is not defined relative to BUILD_OUTPUT in 
spec.gmk. Must not
+# use space in this patsubst to avoid leading space in HOTSPOT_DIST.
+HOTSPOT_DIST:=$(patsubst 
$(OLD_BUILD_OUTPUT)%,$(BUILD_OUTPUT)%,$(HOTSPOT_DIST))
  SJAVAC_SERVER_DIR:=$(patsubst $(OLD_BUILD_OUTPUT)%, $(BUILD_OUTPUT)%, 
$(SJAVAC_SERVER_DIR))

  JAVA_CMD:=$(BOOT_JDK)/bin/java