Convert the rest of the codebase to C89. #201

1. 
   gmaxwell commented at 5:48 pm on January 25, 2015: contributor

   Update build system to enforce -std=c89 -pedantic.
2. Convert tests to C89. (also fixes a use of bare "inline" in field) bf2e1ac7cd
3. Convert the rest of the codebase to C89.

   Update build system to enforce -std=c89 -pedantic.

   f735446c4d
4. 
   sipa commented at 6:21 pm on January 25, 2015: contributor

   ACK
5. sipa merged this on Jan 25, 2015
6. sipa closed this on Jan 25, 2015

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7. sipa referenced this in commit f0d851ee6a on Jan 25, 2015

Contributors
gmaxwell sipa