[cmake] fix OpenGL, git rev identifier (#2530)

Reviewed-on: #2530
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

CMakeModules/GetSCMRev.cmake

@@ -0,0 +1,49 @@
+# SPDX-FileCopyrightText: 2025 crueter
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+include(GetGitRevisionDescription)
+
+function(trim var)
+  string(REGEX REPLACE "\n" "" new "${${var}}")
+  set(${var} ${new} PARENT_SCOPE)
+endfunction()
+
+set(TAG_FILE ${CMAKE_SOURCE_DIR}/GIT-TAG)
+set(REF_FILE ${CMAKE_SOURCE_DIR}/GIT-REFSPEC)
+set(COMMIT_FILE ${CMAKE_SOURCE_DIR}/GIT-COMMIT)
+set(RELEASE_FILE ${CMAKE_SOURCE_DIR}/GIT-RELEASE)
+
+if (EXISTS ${REF_FILE} AND EXISTS ${COMMIT_FILE})
+  file(READ ${REF_FILE} GIT_REFSPEC)
+  file(READ ${COMMIT_FILE} GIT_COMMIT)
+else()
+  get_git_head_revision(GIT_REFSPEC GIT_COMMIT)
+  git_branch_name(GIT_REFSPEC)
+  if (GIT_REFSPEC MATCHES "NOTFOUND")
+    set(GIT_REFSPEC 1.0.0)
+    set(GIT_COMMIT stable)
+  endif()
+endif()
+
+if (EXISTS ${TAG_FILE})
+  file(READ ${TAG_FILE} GIT_TAG)
+else()
+  git_describe(GIT_TAG --tags --abbrev=0)
+  if (GIT_TAG MATCHES "NOTFOUND")
+    set(GIT_TAG "${GIT_REFSPEC}")
+  endif()
+endif()
+
+if (EXISTS ${RELEASE_FILE})
+  file(READ ${RELEASE_FILE} GIT_RELEASE)
+  trim(GIT_RELEASE)
+  message(STATUS "Git release: ${GIT_RELEASE}")
+endif()
+
+trim(GIT_REFSPEC)
+trim(GIT_COMMIT)
+trim(GIT_TAG)
+
+message(STATUS "Git commit: ${GIT_COMMIT}")
+message(STATUS "Git tag: ${GIT_TAG}")
+message(STATUS "Git refspec: ${GIT_REFSPEC}")