Document cleanse of build artifacts

Fixes: romanz#1001

doc/install.md

@@ -5,8 +5,8 @@
 
 ```bash
 $ sudo apt update
-$ sudo apt install -y clang cmake build-essential git cargo 
-$ git clone https://github.com/romanz/electrs 
+$ sudo apt install -y clang cmake build-essential git cargo
+$ git clone https://github.com/romanz/electrs
 $ cd electrs
 $ cargo build --locked --release
 $ ./target/release/electrs --version  # should print the latest version
@@ -206,6 +206,11 @@ Relevant issues: [#134](https://github.com/romanz/electrs/issues/134) and [#391]
 
 #### Dynamic linking
 
+Note that if you have previously done a static linking build, it is recommended to clean the build artifacts to avoid build errors (e.g. https://github.com/romanz/electrs/issues/1001):
+```
+$ cargo clean
+```
+
 ```
 $ ROCKSDB_INCLUDE_DIR=/usr/include ROCKSDB_LIB_DIR=/usr/lib cargo build --locked --release
 ```