use LEGACY_NDK option to build lapack/scipy with a separate NDK #2615
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Google has removed gcc/gfortran support in their latest NDK (r23b), supported by p4a. Building gfortran out-of-tree is possible, but the sysroot, shipped with NDK r23b does not contain enough libraries to properly link objects, generated by gfortran compiler.
This is a workaround to use older NDK, supporting gcc/gfortran (r19c) to build lapack/scipy, while the rest of the recipes build with r23b by default.
A new environment variable is introduced,
LEGACY_NDK
-> to specify the location of the legacy NDK (r19c), containing gcc/gfortran compilers.