INSTALL.md: add missing dependencies and fix formatting
INSTALL.md: add missing dependencies and fix formatting

Clarify that uriparser and libgcrypt dependencies require libraries and
header files.
Fix typos in INSTALL.md such as missing blank lines and markup.

Fixes #810.

01org/TPM2.0-TSS,tpm2-software/tpm2-tss,01org/tpm2-tss,tpm2-software/tpm2-tss,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,01org/tpm2-tss,01org/tpm2-tss,01org/TPM2.0-TSS,01org/TPM2.0-TSS