Commit 05969c6

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Remove ROM routines from libc.a, save progmem (#6432)

Dropped routines form libc.a which are present and usable in ROM: `ar dv libc.a lib_a-strcmp.o lib_a-strlen.o lib_a-strncmp.o lib_a-strstr.o lib_a-memcmp.o lib_a-memcpy.o lib_a-memmove.o lib_a-memset.o lib_a-bzero.o` Left strcpy and strncpy in libc.a because they silently support PROGMEM accesses as required by GCC optimizations. Saves ~628 bytes in AdvancedWebServer example, from IROM (not IRAM). Also allows mem* and str* routines to be safely called from inside an ISR. Prior to this PR, these routines were stored in flash and not IRAM, so they were technically illegal to call while in an ISR. Fixes #6430

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tools/sdk/libc/xtensa-lx106-elf/lib
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`‎tools/sdk/libc/xtensa-lx106-elf/lib/libc.a`

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