CMake: Accept ignored prefixes from build_release_macos.sh

Defaults to ignore:

/opt/local    (MacPorts)
/opt/homebrew (Homebrew on ARM)
/opt/local    (Homebrew on x86)

We want to ignore these paths so any dependencies they might contain don't interfere with the build.

This fixes https://github.com/OrcaSlicer/OrcaSlicer/issues/10460

deps/CMakeLists.txt

@@ -185,6 +185,7 @@ if (NOT IS_CROSS_COMPILE OR NOT APPLE)
             -DCMAKE_INSTALL_PREFIX:STRING=${DESTDIR}
             -DCMAKE_MODULE_PATH:STRING=${PROJECT_SOURCE_DIR}/../cmake/modules
             -DCMAKE_PREFIX_PATH:STRING=${DESTDIR}
+            -DCMAKE_IGNORE_PREFIX_PATH:STRING=${CMAKE_IGNORE_PREFIX_PATH}
             -DCMAKE_DEBUG_POSTFIX:STRING=d
             -DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
             -DCMAKE_CXX_COMPILER:STRING=${CMAKE_CXX_COMPILER}
@@ -232,6 +233,7 @@ else()
             -DCMAKE_POLICY_VERSION_MINIMUM=3.5
             -DCMAKE_INSTALL_PREFIX:STRING=${DESTDIR}
             -DCMAKE_PREFIX_PATH:STRING=${DESTDIR}
+            -DCMAKE_IGNORE_PREFIX_PATH:STRING=${CMAKE_IGNORE_PREFIX_PATH}
             -DBUILD_SHARED_LIBS:BOOL=OFF
             ${_cmake_osx_arch}
             "${_configs_line}"