fixup! chroot-fixups: prevent %install of llvm from taking ages to co…

…mplete

Fix potential coding issues reported by ShellCheck.

scripts/chroot-fixups/rpm-build-scripts.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 script="/usr/lib/rpm/redhat/brp-mangle-shebangs"
 if [ -x $script ]; then
@@ -7,7 +7,7 @@ fi
 
 # skip RPM scripts running in %install that are not needed and break scans
 for script in /usr/lib/rpm/{redhat/brp-llvm-compile-lto-elf,brp-strip-static-archive}; do
-    if [ -f $script ]; then
-        ln -fsvT /bin/true $script
+    if [ -f "$script" ]; then
+        ln -fsvT /bin/true "$script"
     fi
 done