DEB uncrustify: Fix Python detection on CMake < 3.12.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

debian/uncrustify-trinity/uncrustify-trinity-0.73.0/debian/changelog

@@ -1,3 +1,9 @@
+uncrustify-trinity (0.73.0-0debian11.0.0+2) unstable; urgency=medium
+
+  * Fix Python detection on CMake < 3.12.
+
+ -- Slávek Banko <slavek.banko@axis.cz>  Wed, 20 May 2021 00:00:40 +0200
+
 uncrustify-trinity (0.73.0-0debian11.0.0+1) unstable; urgency=medium
 
   * Backported commits cb1a42dd from upstream.

debian/uncrustify-trinity/uncrustify-trinity-0.73.0/debian/patches/006_fix_python_detection_on_older_cmake.diff

@@ -0,0 +1,22 @@
+Fix Python detection on CMake < 3.12.
+===================================================================
+--- uncrustify-trinity-0.73.0.orig/CMakeLists.txt
++++ uncrustify-trinity-0.73.0/CMakeLists.txt
+@@ -17,8 +17,15 @@ include(CheckCXXSymbolExists)
+ include(CheckTypeSize)
+ include(CTest)
+ 
+-find_package(Python3 REQUIRED)
+-set(PYTHON_EXECUTABLE ${Python3_EXECUTABLE})
++if( ${CMAKE_VERSION} VERSION_LESS "3.12" )
++    find_package( PythonInterp )
++    if( NOT PYTHON_EXECUTABLE )
++        message( FATAL_ERROR "Python is required, but was not found on your system" )
++    endif()
++ else( )
++    find_package(Python3 REQUIRED)
++    set(PYTHON_EXECUTABLE ${Python3_EXECUTABLE})
++endif()
+ 
+ #
+ # Check compiler flags

debian/uncrustify-trinity/uncrustify-trinity-0.73.0/debian/patches/series

@@ -3,3 +3,4 @@
 003_allow_older_distributions.diff
 004_fixed_usage.diff
 005_upstream_cb1a42dd.diff
+006_fix_python_detection_on_older_cmake.diff