lsame: simplify using IACHAR#1303
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Replace ICHAR with the F95 intrinsic IACHAR, which always returns ASCII codes regardless of the platform's native character encoding. This eliminates the entire EBCDIC/Prime machine detection branch (logic testing ZCODE against ASCII/EBCDIC/Prime codes), producing shorter, simpler, and equivalent code. Closes Reference-LAPACK#701
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Replace ICHAR with the F95 intrinsic IACHAR, which always returns ASCII codes regardless of the platform's native character encoding. This eliminates the entire EBCDIC/Prime machine detection branch (logic testing ZCODE against ASCII/EBCDIC/Prime codes), producing shorter, simpler, and equivalent code.
Closes #701