Fix primitive boolean field lookup

[gshaowei6]

Fixes Syncleus/aparapi#91.

Primitive instance boolean kernel fields currently fail before OpenCL execution because the native argument reader looks up the Java field with JNI signature B and reads it via GetByteField. Java boolean fields use signature Z, so a kernel like private boolean isInverse = true; throws NoSuchFieldError: ... isInverse B on the GPU path.

This matches the existing static boolean path, which already uses Z and GetStaticBooleanField, and keeps the OpenCL argument size unchanged because jboolean is still passed as the one-byte scalar used by the generated char kernel argument.

Validation performed:

• Reproduced the current failure with the issue's minimal boolean-kernel shape on Windows/OpenCL: NoSuchFieldError ... isInverse B.
• Checked the generated OpenCL still emits a scalar char argument and if (this->isInverse!=0).
• Ran git diff --check.

[gshaowei6]

Additional validation after opening the PR:

• Built the patched native DLLs with the project Docker builder after initializing the java submodule and running ./buildMingW.sh in a clean container copy.
• Overrode the local aparapi-jni classpath resources with the patched Windows x64 DLLs and reran the issue's minimal primitive-boolean kernel.
• Before this fix, the same probe failed with NoSuchFieldError: ... isInverse B; with the patched DLL it completes on OpenCL and reports runningCL=true.