update with results of commit https://github.com/OSGeo/PROJ/commit/53c07a8bd211b7aee4bc07a9c6726005504b7181gh-pages

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+.. _macros:
+
+================================================================================
+Macros
+================================================================================
+
+.. c:macro:: PROJ_VERSION_MAJOR
+
+    Major version number, e.g. 8 for PROJ 8.0.1
+
+.. c:macro:: PROJ_VERSION_MINOR
+
+    Minor version number, e.g. 0 for PROJ 8.0.1
+
+.. c:macro:: PROJ_VERSION_PATCH
+
+    Patch version number, e.g. 1 for PROJ 8.0.1
+
+.. c:macro:: PROJ_COMPUTE_VERSION(maj,min,patch)
+
+    .. versionadded:: 8.0.1
+
+    Compute the version number from the major, minor and patch numbers.
+
+.. c:macro:: PROJ_VERSION_NUMBER
+
+    .. versionadded:: 8.0.1
+
+    Total version number, equal to
+    ``PROJ_COMPUTE_VERSION(PROJ_VERSION_MAJOR, PROJ_VERSION_MINOR, PROJ_VERSION_PATCH)``
+
+.. c:macro:: PROJ_AT_LEAST_VERSION(maj,min,patch)
+
+    .. versionadded:: 8.0.1
+
+    Macro that returns true if the current PROJ version is at least the version
+    specified by (maj,min,patch)
+
+    Equivalent to ``PROJ_VERSION_NUMBER >= PROJ_COMPUTE_VERSION(maj,min,patch)``