build-proton-tc.sh: Work around ELF type bug in older versions of file

file versions 5.35 and older incorrectly report the type of ELF PIE
executables as shared objects and vice versa -- the types appear to have
been swapped. Version 5.32 is even more broken in that it reports both
types as shared objects.

Check for "interpreter" instead in file's output to work around this
issue in our rpath setter.

Tested versions of file:
5.37: ok
5.36: ok
5.35: broken (swapped)
5.32: broken (all shared objects)

Signed-off-by: Danny Lin <danny@kdrag0n.dev>

build-proton-tc.sh

@@ -45,8 +45,8 @@ for f in $(find install -type f -exec file {} \; | grep 'not stripped' | awk '{p
 done
 
 # Set executable rpaths so setting LD_LIBRARY_PATH isn't necessary
-msg "Setting library paths for porability..."
-for bin in $(find install -type f -exec file {} \; | grep 'ELF .* executable' | awk '{print $1}'); do
+msg "Setting library load paths for portability..."
+for bin in $(find install -type f -exec file {} \; | grep 'ELF .* interpreter' | awk '{print $1}'); do
 	# Remove last character from file output (':')
 	bin="${bin: : -1}"