Update make logic for Windows dll check

[WardBrian]

Submisison Checklist

• Run tests: ./runCmdStanTests.py src/test
• Declare copyright holder and open-source license: see below

Summary:

Resolves #1027 by changing the detection logic to be substring-based rather than strict equality

Intended Effect:

Make tbb check more robust on Windows

How to Verify:

Run on a windows machine with two copies of tbb.dll in the PATH

Side Effects: None

Documentation: No change

Copyright and Licensing

Please list the copyright holder for the work you are submitting (this will be you or your assignee, such as a university or company): Simons Foundation

By submitting this pull request, the copyright holder is agreeing to license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[stan-buildbot]

---

Name	Old Result	New Result	Ratio	Performance change( 1 - new / old )
gp_pois_regr/gp_pois_regr.stan	3.01	3.05	0.99	-1.52% slower
low_dim_corr_gauss/low_dim_corr_gauss.stan	0.02	0.02	0.98	-2.19% slower
eight_schools/eight_schools.stan	0.11	0.1	1.03	2.71% faster
gp_regr/gp_regr.stan	0.16	0.16	0.99	-1.28% slower
irt_2pl/irt_2pl.stan	5.82	5.82	1.0	0.0% slower
performance.compilation	88.3	87.44	1.01	0.97% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan	8.74	8.64	1.01	1.15% faster
pkpd/one_comp_mm_elim_abs.stan	30.39	30.43	1.0	-0.14% slower
sir/sir.stan	126.28	126.34	1.0	-0.05% slower
gp_regr/gen_gp_data.stan	0.03	0.04	0.96	-4.26% slower
low_dim_gauss_mix/low_dim_gauss_mix.stan	3.16	3.05	1.04	3.49% faster
pkpd/sim_one_comp_mm_elim_abs.stan	0.39	0.4	0.98	-2.28% slower
arK/arK.stan	1.91	1.87	1.02	2.05% faster
arma/arma.stan	0.83	0.83	1.0	-0.2% slower
garch/garch.stan	0.54	0.53	1.02	1.95% faster
Mean result: 1.00068070355

---

Jenkins Console Log
Blue Ocean
Commit hash: 5a2979c

---

Machine information

ProductName: Mac OS X ProductVersion: 10.11.6 BuildVersion: 15G22010

CPU:
Intel(R) Xeon(R) CPU E5-1680 v2 @ 3.00GHz

G++:
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.6.0
Thread model: posix

Clang:
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.6.0
Thread model: posix

[WardBrian]

This should be ready for review now. My original attempt was wrong by a character (ifneq vs ifeq)

[stan-buildbot]

---

Name	Old Result	New Result	Ratio	Performance change( 1 - new / old )
gp_pois_regr/gp_pois_regr.stan	3.03	2.97	1.02	2.0% faster
low_dim_corr_gauss/low_dim_corr_gauss.stan	0.02	0.02	1.0	0.43% faster
eight_schools/eight_schools.stan	0.11	0.11	1.0	0.12% faster
gp_regr/gp_regr.stan	0.16	0.16	1.02	2.07% faster
irt_2pl/irt_2pl.stan	5.88	5.86	1.0	0.34% faster
performance.compilation	88.35	87.39	1.01	1.08% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan	8.64	8.69	0.99	-0.58% slower
pkpd/one_comp_mm_elim_abs.stan	30.91	29.77	1.04	3.7% faster
sir/sir.stan	128.24	130.35	0.98	-1.64% slower
gp_regr/gen_gp_data.stan	0.03	0.04	0.99	-1.47% slower
low_dim_gauss_mix/low_dim_gauss_mix.stan	2.99	3.03	0.99	-1.09% slower
pkpd/sim_one_comp_mm_elim_abs.stan	0.42	0.41	1.03	2.68% faster
arK/arK.stan	1.86	1.88	0.99	-1.0% slower
arma/arma.stan	0.84	0.85	0.99	-1.05% slower
garch/garch.stan	0.53	0.53	1.0	0.47% faster
Mean result: 1.00430702997

---

Jenkins Console Log
Blue Ocean
Commit hash: bede69e

---

Machine information

ProductName: Mac OS X ProductVersion: 10.11.6 BuildVersion: 15G22010

CPU:
Intel(R) Xeon(R) CPU E5-1680 v2 @ 3.00GHz

G++:
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.6.0
Thread model: posix

Clang:
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.6.0
Thread model: posix

[rok-cesnovar]

Thanks Brian!