This reverts commit 41b8479d, reversing
changes made to 531471b0.

Reason: breaks the build.

We don't use -Wcast-align ourselves, but the headers trigger warnings
for those users who do, which is not nice.

JNI check became optional;
Pathes to SDK, NDK and Java API level can be defined by command line.

It increases performance on some devices like Nexus4.
Target Android SDK version increased up to 14.

They're unsequenced if CV_IMIN3 or CV_IMAX3 are invoked more than once
in a single expression.

added IPP optimization of separable 32f filters; fixed IPP version check in DFT; fixed conditions in IPP optimization of norm functions.

begin_x[1] is not the second component of the element, but the element
after the one pointed to begin_x. When begin_x points to the last
element, that line overwrites data past the end of the allocation, which,
during my tests, happened to contain the reference count for the matrix.
Hilarity ensues.