CheckSezpoz: use ToolProvider.getSystemJavaCompiler()
CheckSezpoz: use ToolProvider.getSystemJavaCompiler()

... but fall back to calling the apt class directly if we're not running inside a JDK.

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

scijava/scijava-common