devel/mustach: Update to 1.2.5

Changes in 1.2.5:

Fix:
- Don't override CFLAGS in Makefile
- Use of $(INSTALL) in Makefile for setting options

Minor:
- Orthograf of 'instantiate'

Changes in 1.2.4:

Fix:
- Latent SIGSEGV using cJSON

Changes in 1.2.3:

New:
- Flag Mustach_With_ErrorUndefined (and option --strict for the tool)
  for returning a requested tag is not defined
- Test of specifications in separate directory

Fix:
- Version printing is now okay
- Compiling libraries on Darwin (no soname but install_name)
- Compiling test6 with correct flags
- Update test from specifications
- Better use of valgrind reports

(sjmulder)