Update Dockerfile-linux.template

Co-authored-by: Tianon Gravi <admwiggin@gmail.com>

Author: sspans-sbp

Dockerfile-linux.template

@@ -281,9 +281,7 @@ end
 	apt-mark auto '.*' > /dev/null; \
 	apt-mark manual $savedAptMark; \
 	find /usr/local -type f -executable -not \( -name '*tkinter*' \) -exec ldd '{}' ';' \
-		| awk '/=>/ { print $(NF-1) }' \
-		| sort -u \
-		| awk '{ print $1; system("realpath " $1) }' \
+		| awk '/=>/ { so = $(NF-1); if (index(so, "/usr/local/") == 1) { next }; gsub("^/(usr/)?", "", so); print so }' \
 		| sort -u \
 		| xargs -r dpkg-query --search \
 		| cut -d: -f1 \