autotools: use bash for gen_shaders*.sh
Summary:
Fixes src-on-NFS builds on FreeBSD, especially when the current shell is
not bash.
Test Plan:
Before:
SHADERS modules/evas/engines/gl_common/shader/evas_gl_shaders.x
gmake[4]: modules/evas/engines/gl_common/shader/gen_shaders.sh: Command not found
Makefile:34122: recipe for target 'modules/evas/engines/gl_common/shader/evas_gl_shaders.x' failed
gmake[4]: *** [modules/evas/engines/gl_common/shader/evas_gl_shaders.x] Error 127
Even manually adjusting path doesn't fix it (and the file is clearly `+x`):
$ ls -l src/modules/evas/engines/gl_common/shader/gen_shaders.sh
-rwxrwxrwx 1 1000 1000 1848 Apr 8 17:01 src/modules/evas/engines/gl_common/shader/gen_shaders.sh
$ export PATH="$PATH:$(pwd)/src"
$ modules/evas/engines/gl_common/shader/gen_shaders.sh
zsh: no such file or directory: modules/evas/engines/gl_common/shader/gen_shaders.sh
After patch:
SHADERS modules/evas/engines/gl_common/shader/evas_gl_shaders.x
CC modules/evas/engines/software_x11/modules_evas_engines_software_x11_module_la-evas_x_egl.lo
CC modules/evas/engines/software_x11/modules_evas_engines_software_x11_module_la-evas_xlib_swapbuf.lo
...
Projects: #efl
Differential Revision: https://phab.enlightenment.org/D2314
Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>