contribs: remove bashism, remove generated link from VCS

extras/contrib/Makefile

-/Users/steg/Sources/vlc/extras/contrib/contrib.mak
\ No newline at end of file

extras/contrib/bootstrap

@@ -355,10 +355,10 @@ case "$DISTRO" in
 esac
 
 # Save passed flags
-EXTRA_CFLAGS+=" $CFLAGS"
-EXTRA_LDFLAGS+=" $LDFLAGS"
-EXTRA_CPPFLAGS+=" $CPPFLAGS"
-EXTRA_CXXFLAGS+=" $CXXFLAGS"
+EXTRA_CFLAGS="$EXTRA_CFLAGS $CFLAGS"
+EXTRA_LDFLAGS="$EXTRA_LDFLAGS $LDFLAGS"
+EXTRA_CPPFLAGS="$EXTRA_CPPFLAGS $CPPFLAGS"
+EXTRA_CXXFLAGS="$EXTRA_CXXFLAGS $CXXFLAGS"
 
 uppercase_distro=`echo "$DISTRO" | tr '[:lower:]' '[:upper:]'`
 add_makefile_cfg "HAVE_${uppercase_distro} = 1"