configure: set PKG_CONFIG_PATH_CUSTOM
This variable is necessary in some distributions, for example cross compiling with Archlinux's MinGW package. Archlinux MinGW package overrides PKG_CONFIG_PATH when cross-compiling.
This variable is necessary in some distributions, for example cross compiling with Archlinux's MinGW package. Archlinux MinGW package overrides PKG_CONFIG_PATH when cross-compiling.
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