re-add -G0 compile flag

[madebr]

Fixes linking errors such as:

/ps2dev/ee/lib/gcc-lib/ee/3.2.3/../../../../ee/lib/libg.a(writer.o)(.text+0x1c): In function `_write_r':
../../../../../newlib/libc/reent/writer.c:57: relocation truncated to fit: R_MIPS_GPREL16 errno
/ps2dev/ee/lib/gcc-lib/ee/3.2.3/../../../../ee/lib/libg.a(writer.o)(.text+0x48):../../../../../newlib/libc/reent/writer.c:60: relocation truncated to fit: R_MIPS_GPREL16 errno
/ps2dev/ee/lib/gcc-lib/ee/3.2.3/../../../../ee/lib/libg.a(closer.o)(.text+0x4): In function `_close_r':
../../../../../newlib/libc/reent/closer.c:52: relocation truncated to fit: R_MIPS_GPREL16 errno
/ps2dev/ee/lib/gcc-lib/ee/3.2.3/../../../../ee/lib/libg.a(closer.o)(.text+0x38):../../../../../newlib/libc/reent/closer.c:55: relocation truncated to fit: R_MIPS_GPREL16 errno
/ps2dev/ee/lib/gcc-lib/ee/3.2.3/../../../../ee/lib/libg.a(fstatr.o)(.text+0x18): In function `_fstat_r':
../../../../../newlib/libc/reent/fstatr.c:61: relocation truncated to fit: R_MIPS_GPREL16 errno
/ps2dev/ee/lib/gcc-lib/ee/3.2.3/../../../../ee/lib/libg.a(fstatr.o)(.text+0x40):../../../../../newlib/libc/reent/fstatr.c:64: relocation truncated to fit: R_MIPS_GPREL16 errno
/ps2dev/ee/lib/gcc-lib/ee/3.2.3/../../../../ee/lib/libg.a(lseekr.o)(.text+0x1c): In function `_lseek_r':
../../../../../newlib/libc/reent/lseekr.c:57: relocation truncated to fit: R_MIPS_GPREL16 errno
/ps2dev/ee/lib/gcc-lib/ee/3.2.3/../../../../ee/lib/libg.a(lseekr.o)(.text+0x48):../../../../../newlib/libc/reent/lseekr.c:60: relocation truncated to fit: R_MIPS_GPREL16 errno
/ps2dev/ee/lib/gcc-lib/ee/3.2.3/../../../../ee/lib/libg.a(readr.o)(.text+0x1c): In function `_read_r':
../../../../../newlib/libc/reent/readr.c:57: relocation truncated to fit: R_MIPS_GPREL16 errno
/ps2dev/ee/lib/gcc-lib/ee/3.2.3/../../../../ee/lib/libg.a(readr.o)(.text+0x48):../../../../../newlib/libc/reent/readr.c:60: relocation truncated to fit: R_MIPS_GPREL16 errno