doc: Update version.m4 and CHANGES for 4.3.0rc2

Author: raffenet

CHANGES

@@ -60,6 +60,11 @@
 
 # Make check target will run ROMIO tests.
 
+# Add back handle conversion macros (f2c/c2f) to preserve ABI
+  compatibility with older MPICH libraries
+
+# Fix compilation issue with g++ in -std=gnu++20 mode
+
 ===============================================================================
                                Changes in 4.2
 ===============================================================================

maint/version.m4

@@ -14,7 +14,7 @@
 # changing this by playing with diversions, but then we would probably be
 # playing with autotools-fire.
 
-m4_define([MPICH_VERSION_m4],[4.3.0rc1])dnl
+m4_define([MPICH_VERSION_m4],[4.3.0rc2])dnl
 m4_define([MPICH_RELEASE_DATE_m4],[unreleased development copy])dnl
 
 # For libtool ABI versioning rules see: