* PHP-5.6:
  fix memory leak

(cherry picked from commit e87daf363b5eb2965a2cb4dec5427a9b83ce88e2)

(cherry picked from commit 99b242a6d093bca1f64084866b4491061de57553)
(cherry picked from commit de643586dee986ff16c0a6be44813687786aa781)

We must not allow negative color values be passed to
gdImageFillToBorder(), because that can lead to infinite recursion
since the recursion termination condition will not necessarily be met.

(cherry picked from commit 863d37ea66d5c960db08d6f4a2cbd2518f0f80d1)
(cherry picked from commit 5693474997b5a804be307583fb7bc3cfcdd50aec)

Instead of rolling our own bounds check we use clip_1d() as it's done
in gdImageLine() and in external libgd. We must not pass the image
width and height, respectively, but rather the largest ordinate value
that is allowed to be accessed, i.e. width-1 and height-1,
respectively.

(cherry picked from commit 6499581af76cfe986e12330faabb3a7c36d45ffc)
(cherry picked from commit 1b5543b8ab22b85c14546649057475fce2083fbd)

(cherry picked from commit 6b21c28b0e82d760f0c3c4da89dae8d2fb685e1b)

Proper soltion would be to call serialize/unserialize and deal with the result,
but this requires more work that should be done by wddx maintainer (not me).

(cherry picked from commit 6045de69c7dedcba3eadf7c4bba424b19c81d00d)

Conflicts:
	ext/wddx/wddx.c

(cherry picked from commit 8c67460a10865f53435c705d08bbc2d60a49f781)

Note: AC_TRY_LINK interprets the source as part of a main function, ending up with int main() { /* ... */ int main() { /* ... */ } ; return 0; } here - Using AC_LINK_IFELSE with AC_LANG_SOURCE directly instead.
(cherry picked from commit 36527eccbb793ef15f828ffa4261d9a862144f07)