Migrate c10/macros/cmake_macros.h.in to torch/headeronly (#158035)

Summary: As above, also changes a bunch of the build files to be better

Test Plan:
internal and external CI

did run buck2 build fbcode//caffe2:torch and it succeeded

Rollback Plan:

Reviewed By: swolchok

Differential Revision: D78016591

Pull Request resolved: https://github.com/pytorch/pytorch/pull/158035
Approved by: https://github.com/swolchok

torch/headeronly/macros/build.bzl

@@ -0,0 +1,28 @@
+def define_targets(rules):
+    rules.cc_library(
+        name = "macros",
+        srcs = [":cmake_macros_h"],
+        hdrs = [
+            # Following the example from c10
+            "Export.h",
+        ],
+        linkstatic = True,
+        local_defines = ["C10_BUILD_MAIN_LIB"],
+        visibility = ["//visibility:public"],
+    )
+
+    rules.cmake_configure_file(
+        name = "cmake_macros_h",
+        src = "cmake_macros.h.in",
+        out = "cmake_macros.h",
+        definitions = [
+            "C10_BUILD_SHARED_LIBS",
+            "C10_USE_MSVC_STATIC_RUNTIME",
+        ] + rules.select({
+            "//c10:using_gflags": ["C10_USE_GFLAGS"],
+            "//conditions:default": [],
+        }) + rules.select({
+            "//c10:using_glog": ["C10_USE_GLOG"],
+            "//conditions:default": [],
+        }),
+    )