Restore support for GFAL2 versions less than 2.10 #181
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Using -D_GFAL2_API_ breaks support for gfal2 versions less than 2.10.
Versions prior to 2.10 used GFAL2_API as the include guard in the gfal_api.h file
If -D_GFAL2_API_ is used on the command line this means that the include guard is already set, and the declarations in the header file is not seen by the compiler, which means the compilation fails.
This was already fixed in a way that supports both versions less than 2.10 and greater than or equal to 2.10 in pull request #106. There is no need to fix the issue again in a way that breaks support for older versions.