[bug #65360] Extend -p output with export status of each variable.

[Dmitry Goncharov]

Follow-up Comment #1, bug#65360 (group make):

This patch has -p print export status, special and conditional flags of each
variable.


$ ls
makefile
$ cat makefile 
hello?=one
all:;
$ ~/src/gmake/make/l64/make -rp |grep  -B1 -w MAKEFLAGS
# makefile special export
MAKEFLAGS = pr


Here make prints that MAKEFLAGS is a special variable and it is exported.



$ ~/src/gmake/make/l64/make -rp |grep  -B1 hello
# makefile conditional do not export (from 'makefile', line 1)
hello = one


Here make prints that hello is conditional and is not exported.


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