Remove mkdep.awk

The `mkdep.awk` file was part of the previous *nix build system and was
used to create a .deps file with a list of dependencies that could be
processed by Automake further on.

Newer build system was done via 9d9d39a
and outdated files removed via 2281541
so the current file in the PHP source code is not used anymore.

Additionally, the *.slo files were processed by this file. The *.slo
files also used to be generated by older libtool so today, these don't
get generated anymore.

.gitignore

@@ -2,7 +2,6 @@
 *~
 .#*
 *.
-*.slo
 *.mk
 *.mem
 *.gcda

scripts/Makefile.frag

@@ -7,7 +7,6 @@ phpbuilddir = $(libdir)/build
 
 BUILD_FILES = \
 	scripts/phpize.m4 \
-	build/mkdep.awk \
 	build/scan_makefile_in.awk \
 	build/libtool.m4 \
 	build/ax_check_compile_flag.m4 \

scripts/phpize.in

@@ -9,7 +9,7 @@ includedir="`eval echo @includedir@`/php"
 builddir="`pwd`"
 SED="@SED@"
 
-FILES_BUILD="mkdep.awk scan_makefile_in.awk shtool libtool.m4 ax_check_compile_flag.m4 ax_gcc_func_attribute.m4 php_cxx_compile_stdcxx.m4"
+FILES_BUILD="scan_makefile_in.awk shtool libtool.m4 ax_check_compile_flag.m4 ax_gcc_func_attribute.m4 php_cxx_compile_stdcxx.m4"
 FILES="acinclude.m4 Makefile.global config.sub config.guess ltmain.sh run-tests*.php"
 CLEAN_FILES="$FILES *.o *.lo *.la .libs/ build/ modules/ install-sh \
 	mkinstalldirs missing config.nice config.sub config.guess configure configure.ac \