build: Rewrite base check_package macro

Introduce OAC_CHECK_PACKAGE (naming so that it can be used in other
projects), which combines many of the pieces being done in
OPAL_CHECK_PACKAGE, OPAL_CHECK_WITHDIR, and in all the individual
package checks.

Additionally, OAC_CHECK_PACKAGE can use pkg-config and OPAL-style
wrapper compilers to retrieve package information, making finding
the right dependent libraries for static builds significantly sanier.

Signed-off-by: Brian Barrett <[email protected]>

Author: bwbarrett