kconfig/lxdialog: get ncurses CFLAGS with pkg-config and fixed btn color #119
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Fixed from vanilla kernel commit: be8af2d54a669
This makes "make menuconfig" also work on systems where ncurses is not
installed in a standard location (such as on NixOS).
This patch changes ldflags() and ccflags() so that it tries pkg-config first,
and only if pkg-config fails does it go back to the fallback/manual checks.
And, adding -DNCURSES_WIDECHAR=1 CFLAGS to prevent ncurses rendering
wrong color on button when changing dialog color by wbkgdset().