-e to fail early: ./configure may fail and further errors from make bury
the original problem in the logs.

-x for easier debugging

Compile the zend_test extension as shared and try loading it with dl()
to test for obvious issues. Doing this as a standalone call because this
is very specific to the CI setup.

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines.

According to POSIX, a line is a sequence of zero or more non-' <newline>'
characters plus a terminating '<newline>' character. [1] Files should
normally have at least one final newline character.

C89 [2] and later standards [3] mention a final newline:
"A source file that is not empty shall end in a new-line character,
which shall not be immediately preceded by a backslash character."

Although it is not mandatory for all files to have a final newline
fixed, a more consistent and homogeneous approach brings less of commit
differences issues and a better development experience in certain text
editors and IDEs.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
[2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2
[3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2

Use --without-libzip in travis, as libzip version available there
is too old (0.10, while 0.11 is required, 1.3.0 is best)

The real plan is to really drop bundled libzip... delayed.
Notice: only system library have full features:
* encryption
* bzip support

This is also used by RM process to test the same things.
Allow generating build output (to a log file) and specifying
number of parallel jobs (rather than hard-code zero).

Leave all defaults as-is for Travis builds.