Android: Fix signal handlers so they actually work. Create Weak Global References for the returned jobject handles. The jobject references passed from the event handler will be local references so we need to use IsSameObject() to compare the handles. Also create a more simple entrypoint to reduce calls.

prefix=@prefix@
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${exec_prefix}/include
 
Name: dwindows
Description: Dynamic Windows Cross platform UI Toolkit
Version: @VERSION@
Libs: -L${prefix}/lib -ldwindows @LIBS@
Cflags: -I${prefix}/include @CFLAGS@ -D@DW_DEFINE@