dont subst files with no substitutions in them

Author: SebKuzminsky

debian/.gitignore

@@ -12,9 +12,6 @@ linuxcnc-doc-*/
 
 # generated from `.in` by debian/configure
 linuxcnc-uspace.install
-linuxcnc-uspace.docs
-linuxcnc-uspace.links
-linuxcnc-uspace-dev.install
 
 *.debhelper
 shlibs.local

debian/configure

@@ -171,11 +171,7 @@ echo >> control
 subst control.main-pkg.in >> control
 
 subst linuxcnc.install.in > ${MAIN_PACKAGE_NAME}.install
-subst linuxcnc.docs.in > ${MAIN_PACKAGE_NAME}.docs
 subst linuxcnc.lintian-overrides.in > ${MAIN_PACKAGE_NAME}.lintian-overrides
-subst linuxcnc.links.in > ${MAIN_PACKAGE_NAME}.links
-
-subst linuxcnc-dev.install.in > ${MAIN_PACKAGE_NAME}-dev.install
 
 subst rules.in > rules
 chmod +x rules