mesa: set version string to 7.7-rc1

Also modify the Makefile to use the correct version for the tarballs.
diff --git a/Makefile b/Makefile
index bd793e7..fbe9890 100644
--- a/Makefile
+++ b/Makefile
@@ -182,7 +182,7 @@
 
 # Rules for making release tarballs
 
-VERSION=7.7-devel
+VERSION=7.7-rc2
 DIRECTORY = Mesa-$(VERSION)
 LIB_NAME = MesaLib-$(VERSION)
 DEMO_NAME = MesaDemos-$(VERSION)
diff --git a/src/mesa/main/version.h b/src/mesa/main/version.h
index fddb9a8..fa233b9 100644
--- a/src/mesa/main/version.h
+++ b/src/mesa/main/version.h
@@ -32,7 +32,7 @@
 #define MESA_MAJOR 7
 #define MESA_MINOR 7
 #define MESA_PATCH 0
-#define MESA_VERSION_STRING "7.7-rc1"
+#define MESA_VERSION_STRING "7.7-rc2"
 
 /* To make version comparison easy */
 #define MESA_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))