kernel lib: textsearch backports
kernel.org commits:
b9c796783151678d08b1ec1ef410685b2515ba51 textsearch: support for case insensitive searching
dde77e604497dada6f224a685278dfb27747ae52 textsearch: convert kmalloc + memset to kzalloc
aebb6a849cfe7d89bcacaaecc20a480dfc1180e7 textsearch: fix Boyer-Moore text search bug
3b76d08190e6b420ed3f5534aa99ee29d82d731f textsearch: ts_bm: support case insensitive searching in Boyer-Moore algorithm
43138833ee9af07e865a4dcbfe81684c9c2f2262 textsearch: ts_fsm: return error on request for case insensitive search
2523c3fc2bc9e34c06a71517844d55353f1f904a textsearch: ts_kmp: support case insensitive searching in Knuth-Morris-Pratt algorithm