update download and changelog for v2.081.0-rc.1

Author: MartinNowak

changelog/2.081.0_pre.dd

@@ -692,6 +692,7 @@ $(CHANGELOG_SEP_TEXT_BUGZILLA)
 
 $(BUGSTITLE_BUGZILLA DMD Compiler regressions,
 
+$(LI $(BUGZILLA 18068): No file names and line numbers in stack trace)
 $(LI $(BUGZILLA 18821): DMD segfault when doing unsafe operation outside of any function)
 $(LI $(BUGZILLA 18905): [Reg 2.079] C++ classes can no longer be used with -betterC)
 $(LI $(BUGZILLA 18936): Internal error: dmd/backend/cgxmm.c 684)

download.dd

@@ -213,7 +213,7 @@ Macros:
     _=BETA=$(COMMENT $0)
     BETA=$0
     B_DMDV2=2.081.0
-    B_SUFFIX=beta.2
+    B_SUFFIX=rc.1
 
         DEB32=$(DLSITE dmd_$(DMDV2)-0_i386.deb)
         DEB64=$(DLSITE dmd_$(DMDV2)-0_amd64.deb)