package/apache: fixing apxs path mangling

package/apache: fixing apxs path mangling

Latest version of Apache introduce a new apxs with a slightly modified
path handling logic. In order to simplify the crosscompilation, the
software removes the common prefix from bin install dir and build
install dir, but for this to work they both should have a common prefix.

So we introduce a new regexp to fix /usr/bin to staging dir, the regexps
are also fixed to replace only the exact path between double quotes, to
avoid replacing the she-bang line.

Fixes:
http://autobuild.buildroot.net/results/c41f31566974209897a3a1ec35afe2536fb248cc
http://autobuild.buildroot.net/results/b93f19976ce96e79ea159c25ed74a7377c78f334

Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
[yann.morin.1998@free.fr:
  - add the last few words about the she-bang blurb
  - do not use quotes in the existing /sur/bin regexp
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>