[xmlsec] Fix to configure when OpenSSL is in /usr/lib

[Scott Cantor]

> This makes perfect sense to me. If there ar no objections 
> from others I would be happy to apply your patch.

Thanks. This isn't the only fix possible, but I added conditionals
around your assignment statements for OPENSSL_CFLAGS and OPENSSL_LIBS
that check for /usr and omit the flag in that case: 

if test $dir != "/usr/include"; then
     OPENSSL_CFLAGS="-I$dir"		<-- original line
 else
     OPENSSL_CFLAGS="-I."
 fi

....

 if test $dir != "/usr/lib"; then
     OPENSSL_LIBS="-L$dir -lcrypto"	<-- original line
 else
     OPENSSL_LIBS="-lcrypto"
 fi

I don't have a diff patch off hand, but I can put one together if you
like.

-- Scott