'all' script automatically 'make's everything

The script 'all', to run all tests, automatically ensures that the
Lua interpreter and the test C libraries (in 'testes/libs/') are
updated with any changes in 'luaconf.h'.

all

@@ -1,4 +1,6 @@
-cd testes
+make -s -j
+cd testes/libs; make -s
+cd ..     # back to directory 'testes'
 ulimit -S -s 2000
 if { ../lua all.lua; } then 
   echo -e "\n\n    final OK!!!!\n\n"