Fix OCCT and OpenCV patching during build (#8465)

* Fix OCCT and OpenCV patching during build

The inclusion of the `--directory` flag here isn't necessary because of
how `PATCH_COMMAND` applies patches. In fact this causes issues when
trying to build from an archive, `--directory` seems to imply `--index`
and thus this patch only succeeds if you're inside an initialized git
repo. If you simply use the archive without a git repo the build fails
at the patch step.

* Alter patch command based on git repo status

`git apply` has different behavior when inside a git repo vs not. If
we're in a git repo we need to fully quality the path for these patches,
otherwise we can omit the directory flag.

---------

Co-authored-by: Joe Palazzolo <joe@joepalazzolo.net>

deps/CMakeLists.txt

@@ -340,6 +340,20 @@ if(NOT FREETYPE_FOUND)
     set(FREETYPE_PKG "dep_FREETYPE") 
 endif()
 
+execute_process(
+    COMMAND ${GIT_EXECUTABLE} rev-parse --is-inside-work-tree
+    RESULT_VARIABLE REV_PARSE_RESULT
+    OUTPUT_VARIABLE REV_PARSE_OUTPUT
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+# Will output "true" and have a 0 return code if within a git repo
+if((REV_PARSE_RESULT EQUAL 0) AND (REV_PARSE_OUTPUT STREQUAL "true"))
+    set(IN_GIT_REPO TRUE)
+    # Find relative path from root to source used for adjusting patch command
+    file(RELATIVE_PATH BINARY_DIR_REL  ${CMAKE_SOURCE_DIR}/.. ${CMAKE_BINARY_DIR})
+endif ()
+
 include(OCCT/OCCT.cmake)
 include(OpenCV/OpenCV.cmake)