Dinamically find radare2 install dir on Windows

[GustavoLCR]

#10613
better #14315

Fixes types and etc not being loaded if radare2 is spawned outside of install dir

[radare]

we should probably return char * in the heap here. this static char *thing will fail if we use more than one rsysprefix in the same function or so

[radare]

maybe do this change in a separate PR. also i dontn like this separation of windows and cutter, i dont see why cutter windows build should be different than the standard windows build

[GustavoLCR]

maybe do this change in a separate PR. also i dontn like this separation of windows and cutter, i dont see why cutter windows build should be different than the standard windows build

cutter doesn't ship a radare2.exe, so if someone installs just cutter this would fail.

Also I think there is one more thing wrong with this. I just noticed that my install dir has a different structure from the one in appveyor, The exes are inside a bin folder on my system. Is this because of the --shared flag?

[codecov-io]

Codecov Report

Merging #14323 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #14323      +/-   ##
==========================================
- Coverage   37.85%   37.84%   -0.01%     
==========================================
  Files         948      948              
  Lines      305785   305802      +17     
==========================================
- Hits       115741   115739       -2     
- Misses     190044   190063      +19

Impacted Files	Coverage Δ
libr/core/cconfig.c	88.56% <ø> (ø)	⬆️
libr/util/sys.c	52.57% <100%> (+0.13%)	⬆️
libr/core/project.c	57.47% <0%> (-0.34%)	⬇️
libr/core/panels.c	0% <0%> (ø)	⬆️

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[GustavoLCR]

I will check the broken tests

[GustavoLCR]

OK, It's working now, but Appveyor is broken on master.

Also because of 977e8ef, I think the build script for Cutter and the Windows installer will have to add \bin to the PATH as well like 1b52bbf

[GustavoLCR]

so is this whahts breaking the build?

@radare no, it isn't even merged on master, and it is master that's broken. I have no idea why. I cannot reproduce

[xarkes]

Lgtm