read all library versions directly from files

This makes building and testing easier because the library Makefile.am
files are use directly rather than as templates. Thanks to Wouter Clarie
for the idea.

.gitignore

@@ -84,12 +84,13 @@ INSTALL
 /stamp-h1
 /stamp-h2
 
-crypto/Makefile.am
 include/openssl/Makefile.am
-ssl/Makefile.am
-tls/Makefile.am
 tests/Makefile.am
 
+crypto/VERSION
+ssl/VERSION
+tls/VERSION
+
 ssl/*.c
 ssl/*.h
 tls/*.c