[BUG] Duplicate header strings after preprocessing

[cliffburdick]

When using the Jitify2 preprocessor the output header contains the same header repeated multiple times, leading to much longer compilations:

__jitify_rel_inc@__jitify_I2@/matx/transforms/solve@__jitify_name@matx/core/tensor.h
__jitify_rel_inc@__jitify_I2@/matx/operators@__jitify_name@matx/core/tensor.h
__jitify_rel_inc@__jitify_I2@/matx/transforms/qr@__jitify_name@matx/core/tensor.h
__jitify_rel_inc@__jitify_I2@/matx/kernels@__jitify_name@matx/core/tensor.h
11 more...

In the source code the file is always included as "matx/core/tensor.h", but the prefix added by Jitify seems to make it unique.