Use git for HiGHS on all platforms

Differential Revision: D101203076

fbshipit-source-id: 99143ac0349a1389a4d0b2761f92f74e87386f4e

Author: r-barnes

build/fbcode_builder/manifests/highs-optimizer

@@ -12,10 +12,3 @@ builder = cmake
 BUILD_TESTING = OFF
 BUILD_EXAMPLES = OFF
 FAST_BUILD = ON
-
-[rpms]
-coin-or-HiGHS
-coin-or-HiGHS-devel
-
-[homebrew]
-highs