set CFLAGS: -std=gnu99
set CFLAGS: -std=gnu99

Fixes the following error message on SmartOS:

$ go get github.com/mattn/go-sqlite3
In file included from /usr/include/stdio.h:37:0,
                 from go/src/github.com/mattn/go-sqlite3/sqlite3.c:8422:
/opt/local/gcc47/lib/gcc/i386-sun-solaris2.11/4.7.3/include-fixed/sys/feature_tests.h:366:2: error: #error "Compiler or options invalid; UNIX 03 and POSIX.1-2001 applications  require the use of c99"

helight/helight_code,joewalnes/go-sqlite3,jabgibson/go-sqlite3,shaxbee/go-sqlite3,accense/go-sqlite3,lyonel/go-sqlite3,wuranbo/go-sqlite3,danderson/go-sqlite3,xeodou/go-sqlcipher,jabgibson/go-sqlite3,helight/helight_code,lyonel/go-sqlite3,vonwenm/go-sqlite3,helight/helight_code,kiwih/go-sqlite3,hujunlong/go-sqlite3,hujunlong/go-sqlite3,JonathanLogan/go-sqlcipher,helight/helight_code,larsmans/go-sqlite3,helight/helight_code,lyonel/go-sqlite3,mattn/go-sqlite3,Schumix/go-sqlite3,JonathanLogan/go-sqlcipher,henrylee2cn/go-sqlite3,ArtemTeleshev/go-sqlite3,vonwenm/go-sqlite3,denji/go-sqlite3,xeodou/go-sqlcipher,kiwih/go-sqlite3,accense/go-sqlite3,mattn/go-sqlite3,mdevan/go-sqlite3,shaxbee/go-sqlite3,marccampbell/go-sqlite3,kiwih/go-sqlite3,andviro/go-sqlite3,mdevan/go-sqlite3,danderson/go-sqlite3,JonathanLogan/go-sqlcipher,joewalnes/go-sqlite3,ArtemTeleshev/go-sqlite3,marccampbell/go-sqlite3,helight/helight_code,mdevan/go-sqlite3,marccampbell/go-sqlite3,Schumix/go-sqlite3,vonwenm/go-sqlite3,danderson/go-sqlite3,denji/go-sqlite3,joewalnes/go-sqlite3,larsmans/go-sqlite3,henrylee2cn/go-sqlite3,gmarik/go-sqlite3,Schumix/go-sqlite3,mattn/go-sqlite3,accense/go-sqlite3,gmarik/go-sqlite3,wuranbo/go-sqlite3,ArtemTeleshev/go-sqlite3,andviro/go-sqlite3,hujunlong/go-sqlite3,helight/helight_code,jabgibson/go-sqlite3,shaxbee/go-sqlite3,xeodou/go-sqlcipher,wuranbo/go-sqlite3,denji/go-sqlite3,helight/helight_code,andviro/go-sqlite3,henrylee2cn/go-sqlite3,larsmans/go-sqlite3,gmarik/go-sqlite3,helight/helight_code