Bump mold version to 2.30.0

libtool mistakes mold 2.4.1 as GNU ld 2.4 and wrongly concludes that our
linker does not support anonymous versioning and suppresses some uses of
version scripts. That has been causing subtle compatibility issues with
programs that use libtool to create their .so files.

Here is the code that mistakes our linker as GNU ld:
https://git.savannah.gnu.org/cgit/libtool.git/tree/m4/libtool.m4?h=v2.4.7#n5066

As a workaround, I decided to bump our linker version so that the version
number is sufficiently large. This is admittedly ugly but I think it's the
simplest solution for the problem.

CMakeLists.txt

@@ -44,7 +44,7 @@
 # features and behave exactly the same.
 
 cmake_minimum_required(VERSION 3.14)
-project(mold VERSION 2.4.1)
+project(mold VERSION 2.30.0)
 
 include(CMakeDependentOption)
 include(CheckSymbolExists)

README.md

@@ -63,7 +63,7 @@ necessary packages. You may need to run it as root.
 git clone https://github.com/rui314/mold.git
 mkdir mold/build
 cd mold/build
-git checkout v2.4.1
+git checkout stable
 ../install-build-deps.sh
 cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=c++ ..
 cmake --build . -j $(nproc)