8056056: Remove unnecessary inclusion of HS_ALT_MAKE from solaris Makefile

Summary: Remove unnecessary inclusion of HS_ALT_MAKE from solaris Makefile
Reviewed-by: erikj, dholmes

make/solaris/Makefile

@@ -159,7 +159,6 @@ BUILDTREE_MAKE    = $(GAMMADIR)/make/$(OSNAME)/makefiles/buildtree.make
 BUILDTREE_VARS    = GAMMADIR=$(GAMMADIR) OS_FAMILY=$(OSNAME) ARCH=$(SRCARCH) BUILDARCH=$(BUILDARCH) LIBARCH=$(LIBARCH)
 BUILDTREE_VARS   += HOTSPOT_RELEASE_VERSION=$(HOTSPOT_RELEASE_VERSION) HOTSPOT_BUILD_VERSION=$(HOTSPOT_BUILD_VERSION) JRE_RELEASE_VERSION=$(JRE_RELEASE_VERSION)
 BUILDTREE_VARS   += ENABLE_FULL_DEBUG_SYMBOLS=$(ENABLE_FULL_DEBUG_SYMBOLS) OBJCOPY=$(OBJCOPY) STRIP_POLICY=$(STRIP_POLICY) ZIP_DEBUGINFO_FILES=$(ZIP_DEBUGINFO_FILES) ZIPEXE=$(ZIPEXE)
-BUILDTREE_VARS   += HS_ALT_MAKE=$(HS_ALT_MAKE)
 
 BUILDTREE         = $(MAKE) -f $(BUILDTREE_MAKE) $(BUILDTREE_VARS)