Cleanup debugging code in libm

David Das (das@) committed Bruce Evan's (bde's) WIP code for
expl() and logl() in git revision 25a4d6bfda29119. That code
included instrumentation that allowed bde to generate pari
scripts used in testing/debugging. This patch removes that
instrumentation as it is unlikely that others will ever use it.

• math/libm/msun/src/math_private.h: . Remove bde's macros for the generation of pari scripts.

• math/libm/msun/ld128/s_expl.c:
• math/libm/msun/ld128/s_logl.c:
• math/libm/msun/ld80/s_expl.c:
• math/libm/msun/ld80/s_logl.c: . Remove bde's DOPRINT_START macro. . Change RETURNP to RETURNF. . Change RETURN2P to RETURNF. Adjust arguments as needed. . Change RETURNPI to RETURNI. . Change RETURN2PI to RETURNI. Adjust arguments as needed.

PR: 272765
MFC after: 1 week