loongson/mirror: links for c99

loongson/mirror C99-1.0.7.zip
loongson/mirror C99-1.0.6.zip
loongson/mirror C99-1.0.5.zip
loongson/mirror C99-1.0.4.zip
loongson/mirror C99-1.0.3.zip
loongson/mirror C99-1.0.2.zip
loongson/mirror C99-1.0.0.zip
loongson/mirror C99-1.0.0b2.zip