Use startswith in targets.

gcc/ChangeLog:

	* common/config/aarch64/aarch64-common.c (aarch64_parse_extension):
	Use startswith function instead of strncmp.
	* common/config/bfin/bfin-common.c (bfin_handle_option): Likewise.
	* common/config/riscv/riscv-common.c (riscv_subset_list::parse): Likewise.
	* config/aarch64/aarch64-sve-builtins-shapes.cc (parse_type): Likewise.
	* config/aarch64/aarch64.c (aarch64_process_one_target_attr): Likewise.
	* config/alpha/alpha.c (alpha_elf_section_type_flags): Likewise.
	* config/arm/aarch-common.c (arm_md_asm_adjust): Likewise.
	* config/arm/arm.c (arm_file_start): Likewise.
	(arm_valid_target_attribute_rec): Likewise.
	(thumb1_md_asm_adjust): Likewise.
	* config/arm/driver-arm.c (host_detect_local_cpu): Likewise.
	* config/avr/avr.c (STR_PREFIX_P): Likewise.
	(avr_set_current_function): Likewise.
	(avr_handle_addr_attribute): Likewise.
	(avr_asm_output_aligned_decl_common): Likewise.
	(avr_asm_named_section): Likewise.
	(avr_section_type_flags): Likewise.
	(avr_asm_select_section): Likewise.
	* config/c6x/c6x.c (c6x_in_small_data_p): Likewise.
	(c6x_section_type_flags): Likewise.
	* config/darwin-c.c (darwin_cfstring_ref_p): Likewise.
	(darwin_objc_declare_unresolved_class_reference): Likewise.
	(darwin_objc_declare_class_definition): Likewise.
	* config/darwin.c (indirect_data): Likewise.
	(darwin_encode_section_info): Likewise.
	(darwin_objc2_section): Likewise.
	(darwin_objc1_section): Likewise.
	(machopic_select_section): Likewise.
	(darwin_globalize_label): Likewise.
	(darwin_label_is_anonymous_local_objc_name): Likewise.
	(darwin_asm_named_section): Likewise.
	(darwin_asm_output_dwarf_offset): Likewise.
	* config/frv/frv.c (frv_string_begins_with): Likewise.
	(frv_in_small_data_p): Likewise.
	* config/gcn/mkoffload.c (STR): Likewise.
	(main): Likewise.
	* config/i386/i386-builtins.c (get_builtin_code_for_version): Likewise.
	* config/i386/i386-options.c (ix86_option_override_internal): Likewise.
	* config/i386/i386.c (x86_64_elf_section_type_flags): Likewise.
	(ix86_md_asm_adjust): Likewise.
	* config/i386/intelmic-mkoffload.c (STR): Likewise.
	* config/i386/winnt.c (i386_pe_asm_named_section): Likewise.
	(i386_pe_file_end): Likewise.
	* config/ia64/ia64.c (ia64_in_small_data_p): Likewise.
	(ia64_section_type_flags): Likewise.
	* config/mips/driver-native.c (host_detect_local_cpu): Likewise.
	* config/mips/mips.c (mips_handle_interrupt_attr): Likewise.
	(mips16_stub_function_p): Likewise.
	(mips_function_rodata_section): Likewise.
	* config/msp430/msp430.c (msp430_mcu_name): Likewise.
	(msp430_function_section): Likewise.
	(msp430_section_type_flags): Likewise.
	(msp430_expand_helper): Likewise.
	* config/nios2/nios2.c (nios2_small_section_name_p): Likewise.
	(nios2_valid_target_attribute_rec): Likewise.
	* config/nvptx/mkoffload.c (process): Likewise.
	(STR): Likewise.
	* config/pa/som.h: Likewise.
	* config/pdp11/pdp11.c (pdp11_output_ident): Likewise.
	* config/riscv/riscv.c (riscv_elf_select_rtx_section): Likewise.
	* config/rs6000/rs6000.c (VTABLE_NAME_P): Likewise.
	(rs6000_inner_target_options): Likewise.
	* config/s390/driver-native.c (s390_host_detect_local_cpu): Likewise.
	* config/sparc/driver-sparc.c (host_detect_local_cpu): Likewise.
	* config/vax/vax.c (vax_output_int_move): Likewise.
	* config/vms/vms-ld.c (startswith): Likewise.
	(process_args): Likewise.
	(main): Likewise.
	* config/vms/vms.c: Likewise.