Mac: dw_percent_set_pos() does not update the position when not called from the main thread on Mojave. After implementing this change it occurs to me that functions that return nothing, can probably avoid blocking while waiting for the main thread. Consider this for future macro changes.

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@