[workspace] Remove globbing from qhull build

Don't build unnecessary files: Coordinates.cpp, PointCoordinates.cpp,
QhullPoints.cpp, QhullStat.cpp, RboxPoints.cpp, rboxlib_r.c.

This makes our build and object code footprint smaller, and enables a
future commit to use a better technique for C++ symbol visibility.

tools/workspace/qhull/package.BUILD.bazel

@@ -7,35 +7,66 @@ load(
 
 licenses(["notice"])  # Qhull
 
-package(default_visibility = ["//visibility:public"])
+package(default_visibility = ["//visibility:private"])
+
+_HDRS_C = glob([
+    "src/libqhull_r/*.h",
+])
+
+_HDRS_CPP = glob([
+    "src/libqhullcpp/*.h",
+])
+
+_SRCS_C = [
+    "src/libqhull_r/geom2_r.c",
+    "src/libqhull_r/geom_r.c",
+    "src/libqhull_r/global_r.c",
+    "src/libqhull_r/io_r.c",
+    "src/libqhull_r/libqhull_r.c",
+    "src/libqhull_r/mem_r.c",
+    "src/libqhull_r/merge_r.c",
+    "src/libqhull_r/poly2_r.c",
+    "src/libqhull_r/poly_r.c",
+    "src/libqhull_r/qset_r.c",
+    "src/libqhull_r/random_r.c",
+    "src/libqhull_r/stat_r.c",
+    "src/libqhull_r/user_r.c",
+    "src/libqhull_r/usermem_r.c",
+]
+
+_SRCS_CPP = [
+    "src/libqhullcpp/Qhull.cpp",
+    "src/libqhullcpp/QhullFacet.cpp",
+    "src/libqhullcpp/QhullFacetList.cpp",
+    "src/libqhullcpp/QhullFacetSet.cpp",
+    "src/libqhullcpp/QhullHyperplane.cpp",
+    "src/libqhullcpp/QhullPoint.cpp",
+    "src/libqhullcpp/QhullPointSet.cpp",
+    "src/libqhullcpp/QhullQh.cpp",
+    "src/libqhullcpp/QhullRidge.cpp",
+    "src/libqhullcpp/QhullSet.cpp",
+    "src/libqhullcpp/QhullUser.cpp",
+    "src/libqhullcpp/QhullVertex.cpp",
+    "src/libqhullcpp/QhullVertexSet.cpp",
+    "src/libqhullcpp/RoadError.cpp",
+    "src/libqhullcpp/RoadLogEvent.cpp",
+]
 
 cc_library(
     name = "qhull",
-    hdrs = glob([
-        "src/libqhullcpp/*.h",
-        "src/libqhull_r/*.h",
-    ]),
+    hdrs = _HDRS_C + _HDRS_CPP,
     copts = [
         "-fvisibility=hidden",
     ],
     includes = ["src"],
-    srcs = glob(
-        [
-            "src/libqhullcpp/*.cpp",
-            "src/libqhull_r/*.c",
-        ],
-        exclude = [
-            "src/libqhullcpp/qt-qhull.cpp",
-            "src/libqhullcpp/usermem_r-cpp.cpp",
-            "src/libqhull_r/userprintf_r.c",
-            "src/libqhull_r/userprintf_rbox_r.c",
-        ],
-    ),
+    srcs = _SRCS_C + _SRCS_CPP,
     linkstatic = 1,
+    visibility = ["//visibility:public"],
 )
 
 # Install the license file.
 install(
     name = "install",
     docs = ["COPYING.txt"],
+    visibility = ["//visibility:public"],
 )