packages: rename FOO_MAKE_OPT into FOO_MAKE_OPTS

While the autotools infrastructure was using FOO_MAKE_OPT, generic packages
were typically using FOO_MAKE_OPTS. This inconsistency becomes a problem
when a new infrastructure is introduced that wants to make use of
FOO_MAKE_OPT(S), and can live alongside either generic-package or
autotools-package. The new infrastructure will have to choose between either
OPT or OPTS, and thus rule out transparent usage by respectively generic
packages or generic packages. An example of such an infrastructure is
kconfig-package, which provides kconfig-related make targets.

The OPTS variant is more logical, as there are typically multiple options.

This patch renames all occurrences of FOO_MAKE_OPT in FOO_MAKE_OPTS.
Sed command used:
    find * -type f | xargs sed -i 's#_MAKE_OPT\>#&S#g'

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

docs/manual/adding-packages-autotools.txt

@@ -111,7 +111,7 @@ cases, typical packages will therefore only use a few of them.
   variables to pass to make in the build step. These are passed before
   the +make+ command. By default, empty.
 
-* +LIBFOO_MAKE_OPT+, to specify additional variables to
+* +LIBFOO_MAKE_OPTS+, to specify additional variables to
   pass to make in the build step. These are passed after the
   +make+ command. By default, empty.
 

docs/manual/adding-packages-cmake.txt

@@ -108,7 +108,7 @@ typical packages will therefore only use a few of them.
   pass to make in the build step. These are passed before the +make+
   command. By default, empty.
 
-* +LIBFOO_MAKE_OPT+, to specify additional variables to pass to make
+* +LIBFOO_MAKE_OPTS+, to specify additional variables to pass to make
   in the build step. These are passed after the +make+ command. By
   default, empty.
 

docs/manual/adding-packages-kconfig.txt

@@ -47,7 +47,7 @@ be set to suit the needs of the package under consideration:
   support, for example 'menuconfig xconfig'. By default, 'menuconfig'.
 
 * +FOO_KCONFIG_OPT+: extra options to pass when calling the kconfig
-  ediftors. This may need to include '$(FOO_MAKE_OPT)', for example. By
+  editors. This may need to include '$(FOO_MAKE_OPTS)', for example. By
   default, empty.
 
 * +FOO_KCONFIG_FIXUP_CMDS+: a list of shell commands needed to fixup the