Work around build issues with custom LC_COLLATE values.

Some users use a customized LC_COLLATE value, which is known to
be a source of script breakage.
This patch makes sure that LC_COLLATE is set to C (the default)
when building.

Signed-off-by: Mauro Giachero <mauro.giachero@gmail.com>

ChangeLog-current.txt

@@ -33,4 +33,5 @@ enhancements:
     starting the build process.
   * Reworked the options selection menu to avoid seeing only a truncated set
     of the actual options.
+  * Work around build issues caused by custom LC_COLLATE values.
 +--------------------------+

src/usr/sbin/sbopkg

@@ -3133,6 +3133,11 @@ build_package() {
                 [[ $BUILDOPTIONS ]] && eval "export $BUILDOPTIONS"
             fi
             export OUTPUT=$SB_OUTPUT
+            # Custom LC_COLLATE settings can break scripts (since some
+            # expressions, like [A-Z], don't behave as expected -- for
+            # example, LC_COLLATE=fr_FR expands it to AbBcC..zZ).
+            # See also the comment in /etc/profile.d/lang.sh
+            export LC_COLLATE=C
             if [[ $CLEANUP ]]; then
                 # We want to remove all the build residuals after running the
                 # SlackBuild script. To do that reliably (i.e. without