[Code scan] Make clean_build.sh succeed when no shared libraries exist

[njzjz]

This issue comes from a Codex global scan of deepmodeling/tbplas at commit 4d3652b.

Severity: Low

clean_build.sh pipes find . -name "*.so" into xargs rm. On a clean tree with no shared libraries, xargs still runs rm with no operands, causing the script to exit nonzero.

Code reference:

tbplas/scripts/clean_build.sh

Lines 1 to 5 in 4d3652b

	#! /bin/bash
	# Clean local build and so files
	test -d build && rm -rf build
	find . -name "*.so" | xargs rm

Suggested fix: use find . -name "*.so" -delete, or xargs -r rm where GNU xargs is available.