Android: During dw_file_browse() request read/write access to external storage. Was hoping this would fix the file access problem in DWIB but sadly it did not, however I still think we need this permission so leaving the code changes. It also required updating the androidx libraries and adding the activity library. After updating there were some reported code errors so those are fixed in this commit as well.

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@