Fix case-sensitive variable name in CMakeLists.txt

[innermost47]

Summary

Fixed a case-sensitivity issue in CMakeLists.txt where ${srcs} was used instead of ${SRCS}.

Problem

The build was failing with:

CMake Error at CMakeLists.txt:77 (add_executable):
  No SOURCES given to target: audiogen

Solution

Changed ${srcs} to ${SRCS} on line 77 to match the variable defined on line 75.

Testing

• [x] Project builds successfully
• [x] No CMake configuration errors

Changes

• Line 77: add_executable(audiogen ${srcs}) → add_executable(audiogen ${SRCS})