Makefile.rules_generic: Stop allowing app custom SCRIPT_LD

[xchapron-ledger]

Description

Makefile.rules_generic: Stop allowing app custom SCRIPT_LD

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• Other (for changes that might not fit in any category)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e3f06b3) 59.44% compared to head (1a42176) 59.44%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #477   +/-   ##
=======================================
  Coverage   59.44%   59.44%           
=======================================
  Files          12       12           
  Lines        1684     1684           
=======================================
  Hits         1001     1001           
  Misses        683      683           

Flag	Coverage Δ
unittests	59.44% <ø> (ø)

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